Continuity can't be a bad thing. That's what the Spurs model has been the last 15+ years and with their recent moves they have continue that trend.
Re-signing Boris Diaw and Patty Mills this past week ensures San Antonio will pretty much have it's full rotation back from this year's title team. There's also rumors the Spurs are willing to use their mid-level exception to try and lure Pau Gasol there. If they could do that, the ball would probably never touch the floor on offense. Gasol can land a much bigger contract elsewhere, so the chances of this are slim.
The recent signings make for 12 of the 15 players from last year's Finals roster under contract. The only three that aren't are Matt Bonner, Aron Baynes and Damion James. Bonner will most likely take a discount to stay in San Antonio and I'd highly doubt James is back with the addition of first round pick Kyle Anderson. Baynes has a qualifying offer of $1.1 million and is a restricted free agent, meaning the Spurs have the right to match any offer for him. That most likely fills out the 15 man roster.
One more year
The 2014-2015 season will most likely be the final hoorah for the Spurs with the current roster, as Tiago Splitter, Mills and Diaw are the only ones guaranteed under contract for the 2015-2016 season. Kawhi Leonard will be a restricted free agent after next season and will be one of the more sought out free agents.
I'd highly doubt the Spurs would let Leonard go. Cory Joseph is the only other player under contract and would be a restricted free agent, but the Spurs could be willing to let him go after being passed up by Mills in the rotation. Tim Duncan will most likely retire after an 18th season, and Tony Parker and Manu Ginobili will be free agents.
An Eye on the Spurs
A couple of things to watch for next season will be head coach Gregg Popovich's win total, as he is only 33 wins away from 1,000 career victories. Popovich would become just the eighth coach in NBA history to do so. If the Spurs can win their sixth title, it would move them into tied for third all time with Chicago, only trailing the Lakers (16), and the Celtics (17).
If/when San Antonio makes the playoffs, it would be for the 17th straight year, extending what already is an NBA record.
Maybe some other teams should take notice as some have completely gutted their roster, fired their coach or are looking to make a big splash in free agency. Because according to the Spurs model, continuity must be a good thing...