Very interesting. After running those quotes through my Pop translation machine, it sounds like he's basically saying he's planning on going young but wants to take the transition slowly. Those quotes are good for players like Hill, Mahinmi and Tolliver and bad for Finley, Thomas and Vaughn.
Combine those quotes with what we've heard out of Mahinmi recently and it really sounds like Pop is on board with giving Mahinmi a good shot. Mahinmi is the only "juice and athleticism" the Spurs have at the bigman position, although I'd bet that Tolliver also gets a shot at some point.
If by the end of the season, the Spurs can transition to a rotation that looks like:
PG Tony Parker/George Hill
SG Roger Mason, Jr./Manu Ginobili
SF Bruce Bowen/Ime Udoka
PF Tim Duncan/Anthony Tolliver
C Fabricio Oberto/Ian Mahinmi
that'd be a good combination of veteran experience and lively youth. By Pop's quotes, that sounds like what he might be aiming toward.