Last season's top 10 schools, with transfers as starters (from memory; please point out mistakes):
Penn State: 2 (Carson Kuhn, Corey Keener)
Ohio State: 2 (Joey McKenna, TeShan Campbell)
Iowa: 0 (PD3 didn't clear, Pat Lugo redshirted)
Michigan: 1 (Kevin Beazley)
NC State: 0
Missouri: 2 (Grant Leeth, Heavyweight from WVU)
Cornell: 1 (Fredy Stroker)
Virginia Tech: 1 (Ryan Blees)
Nebraska: 0
Arizona State: 2 (Ryan Millhof, Jason Tsirtsis)
Anecdotally, it does "seem" as though the rate of transfers is increasing.
In general, I don't like the transfer stuff. It makes it more difficult for the kid to earn his degree. But looking at that list of names, there can be some pretty good reasons for transferring, too.
Bigger picture, I'd expect the existing rules restricting transfers to lessen, as the NCAA tries unsuccessfully to defend itself in courts of law re: its "amateurism" rules.
Nebraska had Isaiah White, who nearly AA'd at 165