I've said it before the Tahs remind me so much of Leinster about 6 years ago. A team packed full of talented internationals, a decent pack and some exceptional backs. But come the big occasions they just don't perform.
At times the pack would flatter to deceive and look really good only to be monstered by the opposition when it really mattered. The backline at times was slick and plenty of individual talent. But one or two injuries and it would all fall apart. Just like the Tahs we supporters were left scratching our heads wondering why such talented players never really lived up to their potential as a unit.
Now arguably Leinster have been the best club side in the world over the last 5 years. It wasn't one things that changed that made it work at Leinster and trying to find one magic thing to change at the Tahs wont work either.
Some of the things that helped Leinster I think are also needed at the Tahs:
New coaches brought a fresh approach, sometimes when a team and their coaches are used to doing just OK then it can be hard for them to turn things around as they are all in it together. This means they are less likely to make the tough calls needed to put things right. Tahs definitely need to get rid of Gaffney and maybe make changes in other coaching areas too.
Attitude was a very big thing at Leinster and I think it's also true of the Tahs. There's a perception that being the valiant losers is acceptable. Talk of being unlucky, focusing on the positives after defeats etc. No mater what is said in training giving this type of public perception feeds back into the teams thinking. Leinster changed this with the younger players following the example of BOD and not settling for defeat. The language used after games changed and the passion to improve and not accept coming close but not delivering the victories started to drive the players on.
At Leinster some players who were part of the old culture either retired or were moved on and the new players coming in bought into the new way of thinking.
Change of captain. BOD is and always will be a legend at Leinster but the decision to step down as captain was a very good one. The captain of a club doesn't always have to be the best or flashiest player. Leinster picked a workhorse in Leo Cullen to take over the captaincy and players like him make perfect captains as they'll just get on with it. BOD already had enough pressure and coupled with his injury record it was best to allow him just to focus on his own game. IMHO the captain should be a guy who will play pretty much every game and do the hard graft without grabbing the headlines.
Leinster also moved away from an over reliance on the big names to win games for them. 5-6 years ago the reason Leinster were dangerous to opponents was because BOD, Hickey, Dempsey etc. might produce something special and score the winning try. The Tahs are similar in that it's the big names in the backline that are relied upon to produce the winning try or break. The problem with this is that when those players are injured or in poor form then nothing happens in the backline. Today Leinster are dangerous because of the way the backs link together and the fact that we have 2-3 back up for every positions (who most of Aus probably never heard of, except for Lee Grant) who can slot in and do almost as good a job as the established internationals.
The philosophy now at Leinster is about how we play creating opportunities and danger for our opponents. Then on top of that moments of individual brilliance can give something extra. Leinster change players and move them around the backline all the time but generally it doesn't have any negative affect on performance. The Tahs should be aiming for something similar. Always having to have your best players available and playing in their prefered position to win games makes it difficult to do well in a competition that runs over a season.
Leinster also added some grunt in the pack but blended this with athleticism. In the pack you either have to be among the best at playing a certain style or you need to have the option to mix things up. Munster when they were dominant is a good example. They were the best team in the world at 10 man rugby and they knew that when they went to the tank in the last 20 minutes to close out a game they would have more than the other team. Now Munster are rebuilding their pack after a raft or retirements and the decline of some players. They can't dominate like they used to so they are bringing through players who give them more options.
The Tahs forwards are a good unit and when they decide to take up the ball themselves they can make ground. But they shouldn't always stand toe to toe with the opposition. As stated by others in the thread some NZ and SA packs wont be pushed around. So when you come up against those types of packs you need to run them around the park. So having a mix available would mean rather than picking the best 8 guys every week. At Leinster players like Healy, Strauss, Cronin, Van Der Merwe, Jennings, McLoughlin are swapped in and out of the team based on the type of game they want to play. The same goes for Boss and Reddan at 9 depending if they want to keep the ball in the forwards or move it quickly to the backs. If the Tahs can get into a similar position they will be more potent.
In Europe we always talk about clubs being successful because they have very good squads rather than the first 15 being the best. If there's daylight between the first choice in a position and the next guy, then unless the guy in the jersey is an exceptional talent, there's a problem. The Tahs need more players who can slot in seamlessly when there are injuries, this can be done in one of 2 ways. You can go the French route and have a squad full of international stars, not likely to happen with the salary cap. Or you can go the Leinster route and develop young players, future international, and trust them to perform. Leinster have a conveyer belt of quality backs and is starting to produce more quality forwards.
I'm not saying they can copy Leinster exactly and magically everything will fall into place. But there are definitely some good pointers on where things can be improved from looking at the Leinster model.