Pastner should deepen the rotation if the talent is there. Yes there would be a numbers crunch but other teams are able to successfully play more guys and make it work and in the case of FSU for example not see large numbers of transfers. Playing more people gets the youngsters prepared for life without the seniors and put them in better position when they're the go to players on the team. Most importantly, it would help the veterans. For example, nobody plays more minutes than Jose and he goes full throttle when he's out there. But he also gets hurt every year and it may be in part because of the workload that he has to carry. He was out for games last year with the ankle. And this year we saw him slowed down with a hamstring injury. I'd rather him play 30 a game and then handle a bigger workload in the tournament than be sidelined or slowed down because of wear and tear.True 9 man rotations aren't going to happen. The minutes just aren't there and if you don't believe me go back through FSU's games, in particular the games that were closer or their losses (more on this in a sec). They may have had 9 or even 10 players they felt comfortable going to, but they usually had 8 man rotations and sometimes less. The reality is while players want to play, that's not just true of young players. Starters want to play big time minutes. It's a balancing act and 9 and 10 man rotations just aren't going to be sustainable.
IMO people greatly overexaggerate what the get old stay old philosophy means. It doesn't mean always having 3 seniors or 5 upperclassmen. It means consistently having a core of uperclassmen to lean on. Sometimes that may just be 3 starters and the rest of the rotation is sophs and freshman. But if those 3 upperclassmen are playing 30+ minutes, then you are still old, at least as far as the philosophy goes. And you can maintain that even with a 7 man rotation.
The reality though is that Pastner is doing a big rebuilding job. Yes, even in year 5 there are still aspects that he is building up. One of those is the fact that winning begets winning and that is especially true of depth. For two major reasons, at least, that I can see. One is that it's a lot easier to look like a deep team when you win every other game by 15+. You can play 7 or 8 in more competitive games and then go 9-10 in games you are in no danger of losing after the half. This year we rarely had those opportunities, and after the start of the year the staff was probably gun shy about going deeper in the bench early (especially with Meka and Maxwell being hurt). The second, and the one that is just starting to be a factor for us hopefully, is that it's a lot easier to convince players to have development years where they don't play big roles if they believe they will be competing for championships when their time comes. That's even more true if you can bring in players when they expect that to be the case so they aren't shocked or as likely to be frustrated with low minutes.