I don't think any of this year's teams can beat them in a series, especially without HCA..
Spurs are still their best challenge, but this team just has so many egregious flaws in his matchup:
1- Unreliable shooting
2- Lack of versatility and flexibility in lineups
3- Warriors have the best player on the floor
The first 2 are larger concerns, though..
If Green isn't making shots, Pop needs to take him out, which kills the defense, since Duncan won't be able to stay on the floor, as well..all the perimeter alternatives are poor defenders(or hit or miss in Manu's case)..when you take Duncan out, the alternative is West or Diaw, which eliminates the shot blocking and rim protection, especially if Green is also off the floor..
There's a large gap between the defensive capabilities and offensive capabilities of the Spurs starters vs. their bench..
The Warriors can run versatile lineups without any liabilities at either end, all game..if they want more offense, they can take Bogut out, and while their defense will get worse, it's not a dramatic loss..they can still put 5 guys on the floor that are above average or better on both ends of the floor, or at the very least, not liabilities(unlike the Spurs)..