In fairness, I don't think we can say with any real certainty what Marty is at this point. No one can. He's never been a backup in his career, so it's not like playing him less will make him better, or reverse slowing reflexes. The numbers over the last few seasons overall indicate that he's not a good puck-stopper anymore (the roughly 50-game burst to close out the '11-'12 season was likely the very best of what he has left). I don't see him being that much better than he's been since the start of last season.
Schneider will get a workload this season (don't see how he won't, no matter how many games Marty envisions himself starting) that he's never gotten before, and that's good...we need to see if Schneider can play 50-60 games (or more) in a given year.
I'm not expecting anything out of Marty this year. He's been slowing down. Having only 2 preseason games didn't help him, and now having to go through the season right after losing his father is really going to weigh on him. This is going to be a very hard year for him emotionally, especially if he's already decided to hang them up after this season. (He said he wouldn't announce it publicly)