I think the Spurs are showing in this postseason why Danny absolutely should be bringing back PP and Garnett. The "age factor" which has seemed like overriding factor going into this off season for the Cs in terms of how decisions should be made has never been the biggest factor for me and is even less so after seeing this run by the San Antonio Spurs.
Look at the main parts of the rosters:
Tony Parker Rondo
Danny Green Courney Lee
Manu Ginobili Paul Pierce
Tiago Splitter Barndon Bass
Tim Duncan Kevin Garnett
Kawhi Leonard Jeff Green
Gary Neal Jason Terry
Boris Diaw Jared Sullinger
Matt Bonner ? Insert Player
Certainly many will argue many of these matchups, but I think when you step back from the rosters as a whole, the Cs are not that far off from having a very comparable roster.
There is a huge difference in talent at the top. Duncan was first-team All-NBA. Parker was 2nd team All-NBA. Parker and Duncan were 6th and 7th in MVP balloting, and also both top 10 (6th and 9th) in regular season PER.
So by any measure you want, the Spurs had two top-10 players. That's why they won 58 games and are cruising to the finals.
KG and Pierce, while still very good players, are just not comparable at this stage. As a point of comparison they were 38th and 40th in PER.
When healthy Rondo is terrific, but next year he is returning from an ACL injury, and you just have to recognize that he will probably not be playing at his pre-injury level for some or all of the year.
Put it all together and we just won't have the talent. I think the rest of the Spurs roster is also more talented than ours, but that is secondary to the talent at the top.