I will list for you a few players (mainly from Randwick for obvious reasons) that I have seen in the last few years that haven't got a lot of time or much development simply because there is no space for development in Super Rugby squads. These are players with huge talent but just haven't blossomed immediately, they needed more work and more high level game time, in some cases arrived with a roar and then faded to be discarded. If depth was a problem they should be at that next tier.
AJ Gilbert (7)
Selala Lam (6,8,7)
John Fonokofalafi (Hooker)
Clinton Sills (Winger/13)
Lotu Taukeaiho (Prop)
There you go, some aren't recent, as in this year, but that is just off the top of my head in a couple of minutes.
Just out of curiosity, was AJ Gilbert not in the Reds system for a number of years without ever making a spot his own? This obviously didn't help being behind Croft, but it's not as though he was waded through unseen and untested. He was also seen in the ARC if I remember correctly.
I think people like yourself and Bruce who have are invested heavily in the club system see this as a blight on the clubs, however one needs to be practical. The Force and the Rebels have struggled, continue to struggle, and don't look like not struggling any time soon. Barring the odd gem, a number of players that have been continually overlooked by the other teams aren't going to be the difference for them. As people have stated, there are a number of very average Super Rugby players who have shown to be quite dominant at Shute Shield level when they have returned, so it's not unreasonable to expect other dominant players may only make average Super Rugby players. You only have to look at the combined country team against the British and Irish Lions. This was loaded with club players and EPS squad players yet failed to perform as well as NSW Country did in 2001. It doesn't appear their are a number of battle hardened, Super Rugby players, waiting in the wings ready to go. Tim Davidson is probably the number one example for somebody like myself with minimal intimate knowledge of the Shute Shield. He appears to be one of the best credentialed, and experience Shute Shield players going around (Not sure if he has played in 2013 though), yet has not been able to cement any position at the Rebels, beyond being an injury replacement. Obviously appeared to be a great prospect from what he has shown in Shute Shield, yet after years of plying his trade at that level has shown to be not quite effective at Super Rugby level. It seems to me that if a player like him has been unable to make a compelling case at Super Rugby level, there cannot be a great deal more that obviously would. Professionalism has slowly dimished the club comps to the point where now it seems the top 10% is not as good in comparision to the nation's top 10% as it once was and subsequently the bottom 10% also. The 80% in the middle probably hasn't changed a great deal but the playing level one would imagine, may not be what it was when there were only 66 professional players playing Super Rugby each week for a shortened season. Now it is 110 playing a longer season so those players at the clubs also get less chance to play against the next level of opposition than they did in the Super 12 and Super 14 era.
Also the internationals like Ged Robinson, Jason Woodward and Gareth Delve have been some of the Rebels best players in their history, and have basically seamlessly slotted in. I agree perhaps a limit of 5 would be better, however I don't beleive the Rebels even used all of their allowable import roster spots initially so teams may opt for cheaper, local players with less market currency who they consider to be of much value on the field as an import journeyman, focusing their salary cap space on a couple of key recruits (the JOC (James O'Connor)'s, Higginbothams and Beales of the world) anyway. In the salary cap era, it's not like teams are happy to fritter away their money on players when they have equal quality players in Australia, likely to sign for less.
A long term approach needs to be taken. Growing rugby is all about junior participation and historically, a quality professional/representitive team is part of the pathway of attracting juniors. The way the Rebels are performing at the moment, they aren't going to take a lot of kids away from AFL.
The Force have had a little less luck with Ripia and Pretorious, but neither were factors that they could realistically forsee. This is the only solution that will allow them to immediately add Super Rugby ready players to their rosters, with the help of this building their support, which will build the desire for kids to play at junior level, which will lead to a larger talent pool eventually.