I hear what you're saying, though, I think it really depends on each player. While a problem last year was that we went too young, it was also a problem that we relied on midseason veteran pickups (Marbury and Moore) that fell completely flat. I'd rather be in the position where we pick them up in the offseason to see if it will work out and have the ability to correct our mistakes if need be.
For example, we had Scot Pollard along with House and Posey come in at the start of 07-08. When it was apparent Pollard wouldn't work as the backup center, we were able to go after PJ Brown. This year, since we took a huge flier on a young guy (O'Bryant) preseason, we didn't make a veteran choice until the middle of the season and saddled ourselves with Moore who did as little as POB did.
I guess I don't really care whether guys are young or veteran (though based on Doc's comments, I'd lean toward adding at least one good vet this summer, whether it's Sheed, McDyess, Hill or somebody else), I just want us to get the best players for this season. We have a window that will close - to me, we can worry about picking up athletes with plenty of upside for the future after we win another title. For now, I want the best player period, young or old.