You need NBA talent to win a title, no doubt. But whether that talent is developed (like Michigan has done) or it comes off the shelf is irrelevant. NBA talent that is developed is more likely to be successful in college because it speaks to work ethic that it took for the player to get to that point (case in point, the tranformation of Stauskas from his freshman year to soph). Some one and done talents are great kids. Others act entitled and are just biding their time until the NBA draft and are not likely to contribute a ton to team success.
Let's look at the NCAA champions in the one and done era:
Duke - 3 one and done freshmen, but not the norm even for Duke.
UConn - Experienced team with a senior leading the way.
Louisville - Another experienced team with mostly Jrs and Srs in key roles (Siva, Smith, Dieng).
UK - Had Anthony Davis and MKG but also solid experienced guys after that.
UConn - Kemba Walker, a junior
Duke - An experienced group: Scheyer, Nolan Smith, Singler, Zoubek, etc.
UNC - Hansbrough, Lawson, Ellington, Greene. All Jrs. and Srs.
Kansas - One soph (Darrell Arthur), then 2 Jrs (Rush, Chalmers), 2 Srs.
Florida - Repeat champs, all Juniors
Florida - All sophomores, none were High School All America's.
I see basically 2 teams that were led primarily by one and done freshmen. This year's Duke and 2012 Kentucky.