Between the quality and depth I've got in my bigs, I really don't see an issue.
This is something I see you saying a lot and I just don't see it.
AV and West I like but Martin hasn't played in over 71 games since 2002-03 and has played in over 66 games once in the last 6 years. If the last six years are any indication you can expect at best 50 games, a declining game, less minutes and a restricted postseason performance from him.
Splitter and Bonner aren't exactly what I called high quality players. They are a dime a dozen in this league as neither is really exceptional and got their minutes more out of Popovich resting Duncan so much and having next to nothing at the PF position than actually showing so much quality that they displaced someone.
Brad Miller won't even be playing next year with the severity of his injury.
I'm not going to blast you for lack of health with West, like some, or AV because reports are that both should be okay for the start of the season but who knows whether there will be effects from those injuries.
It's a decent bunch but I just don't see the quality or quality of depth you are talking about.