All they will force people to do is find ways to cheat the cap like they have. How is that good for the long term viability of the league ?
Right now I have serious doubts about the long term viability of the league if after four years you are going to be allowed to buy a title. It's exactly why the cap exists to stop that.
One would hope the FFA have the will and integrity to learn from the GCU experience and police things more carefully in future (yeah, right).
The good thing is that any GCU game is probably going to add a few thousand to each team's home gate because of the buzz surrounding them. And you'd hope that there will be a positive knock-on effect of teams raising their game to compete, leading to more exciting games and in the long run an improvement in the standard of the A League.