But you're simply not addressing one huge issue: what's the alternative?
The Spurs' veteran presence is now in its core, the Big 3. And though your premise isn't off base (i.e. corporate knowledge and veteran knowhow), I just can't come to the same conclusion: the Spurs are lacking in the requisite talent at key positions to just add a couple of vets and be done with it, IMO.
The Spurs shouldn't look to get rid of Hill. He's got a bright future and he's really a of a player, one that's become undervalued and nitpicked to death because of a perceived overvaluing. But the fact remains that his talent lies in an area of strength for the Spurs and he's not going to make his best contributions in this league solely at the 2; he's actually gonna end up playing the point position when it's all said and done (even if people dismiss him playing the position because he's not the prototypical or quintessential point guard -- as if those are what we see winning les).
So if the Spurs could get a guy like Rush to play the now infamous "centerpiece" role and a player at 10 that should be able to contribute off the bench in his first year and potentially grow into a star at the 2/3 in the future, it's hard to see much downside in it. They'd now have the requisite talent and size across the board to get the job done and, really, that's all you can really hope for. I'd much rather have the arsenal to get it done anchored by warhorses like Tim, Manu and Parker, than a team consisting of little-to-no margin of error that's in need of extenuating cir stances or outside factors to get the job done.
If the Spurs were able to roll out: Duncan, Splitter, Rush, Ginobili, Parker in their starting lineup and have a bench that consisted of RJ, 'Dyess, Blair, the #10 pick (George for arguments sake) and whomever makes it from THG (Temple, Hairston and Gee), Mahinmi and a possible vet minimum or two?
I think I could roll with that. I'd take my chances with the youth; and it's not like the team you start the season with is necessarily the team you finish with.