There are some really interesting points in this thread. I'll try to address them.
1) A 30-second shot clock will the downfall of UVA - I am not sure if I buy this. What I think this does is help other teams on the defensive side of the ball. We don't need any help. If teams can't score on us in 35 seconds, they won't be able to in 30 seconds. Also, more possessions do not necessarily translate to more efficient scoring. A shorter shot clock does not make people shoot better or play smarter. In fact, I think a shorter shot clock will put a greater emphasis on efficiency and the efficiency margin (adjusted O - adjusted D). UVa's efficiency margin is excellent this season and I think more possessions would highlight that gap.
2) Bennett will not stay at UVA - He is not leaving UVA for any other college job in my estimation. UVA offers him everything he could possibly want in a college job. Great academic institution, excellent resources, money, top rated conference, and a great basketball environment. His family loves Charlottesville and he's having success here. He might want to jump to the NBA but I think he and others realize that his system in the NBA would probably not succeed.
3) Bennett will not get the most out of future players - I can't think of a single player at UVA that hasn't really improved over their careers. Sure, some players have transferred out and his system is not for everyone but Bennett has shown nothing but an incredible ability to develop players. Will every single player pan out? Of course not. But I don't think there's much evidence to suggest that the success is a result of the current crop of players only.
4) Bennett will not sustain top 5 success - This is one I probably agree with the most. Do you know how hard it is for a non-traditional program to sustain any type of success, let alone top 5 success? UVA will consistently be a top 25 and NCAA tournament team under Bennett. We will not always compete for 1-seeds and NCAA titles but not many teams do. I think, given our recent history at UVA, we can't ask for much more than what he's given us. Whether that translates to postseason success remains to be seen. But I don't think UVA is fading into the middle of the pack either. We will always be a tough out and our offense will continue to improve. We may even land some very high end offensive players in the future. UVA is here to stay under Bennett. But any reasonable UVA fan should temper their expectations if they expect every season to be 28-1 (16-1 in the ACC).