No way it will be on a par in 5 years, maybe 10 at a stretch, any more than it would be in Victoria with the Rebels. Think about it in the other direction: if the AFL said to Brisbane, Gold Coast, Sydney and GWS that they had to do the same to be competitive in the AFL they would be laughed at. Development takes time, as I said before. There are important measures and checkpoints that should be monitored as time goes on and an end goal in mind. To say that the Force should have a majority or significant minority of local players in 5-10 years is pure fantasy IMHO, but there should be a target nonetheless.
WA has four football codes and three of them with top line professional teams. Every last one of them gets their players from all over the country and some internationally too. Why should rugby be any different than Aussie Rules or soccer? It's an open player market and you do what you can to make your team better. Whether we like it or not, you have to try and build some level of success or at least competitiveness to encourage others to strive to play in the local first class team. That means interstate players for now. But it also means putting money and effort into developing juniors. RugbyWA could be doing more I am sure, but it's not like they are doing nothing.