A couple of things:
1 - It doesn't really matter about fan exposure, this is all about exposure to the people who matter....NBA scouts and the like. In that regard, whether UConn is tournament eligible or not is almost inconsequential. The players will still have all of the necessary exposure to NBA scouts, because they are playing in the BE and for UConn (and the players are therefore already on most of the radar screens that count). A great tournament performance might enhance draft position by a little bit, but the scouts know enough to influence their decisions, already, before March.
2 - Things are a world of different for Lamb and Drummond. I agree with the Lamb assessments. He is a fairly known quantity and it is unlikely that next year will provide that much opportunity for him to vastly improve. He might go from a 12-15 pick to a top 10 (or not) but he is likely unable to move into a top 5 pick no matter what.
Drummond, on the other hand, has just so much more to learn/gain. The kid is still so very very raw, that an additional year at this level will only elevate him. I agree with the way folks characterize the vast gulf between his raw ability and his comfort with and knowledge of the game.
3 - As much as I want Drummond fto come back, I cannot make a real persuasive economic argument as to how this would benefit him. Have an accountant run the numbers.....the difference between having all those millions today, as opposed to having them a year from now....well (unless you pull a Brewster's Millions and spend the entire bundle as fast as you make it), you are always better off with the cash in hand, invested today, than you are deferring it.
4 - I am not at all convinced that Drummond is your typical NBA-bound player. The kid was only a couple of days/weeks removed from having spent last year playing high school ball. He truly seems to be enjoying the heck out of being an 18 year old kid. College is a unique experience, and I think it suits Andre very well. He will have ample opportunity to be an NBA player/millionaire for years to come. He only has this one opportunity to be a college student. The NBA money will be there, waiting for him.
I hope he stays! I think he would not regret that decision.