The stats don't bear out your argument. Per Ken Pomeroy the last four years in a row the youngest team in the NCAA tournament has been playing in the NCAA final. The list is:
UConn 2011
Kentucky 2012
Michigan 2013
Kentucky 2014
If you want to argue that a collection of top 100 recruits playing together for 3 or 4 years (Napier, Boat Daniels) is better than a class of top 10 one and dones (Kentucky) than maybe you are right. Fortunately this year that was the case. However, recent history shows you can make a deep run with young players and possibly win the title.
I don't want to see UConn turn into UK by bringing in one and dones and changing the roster dramatically every year, however we'd be crazy if we decided not to go after number 1 overall recruits just because we are afraid they'd leave after one year.