Yeah, Plush has nothing left to prove. He is the most successful singles skater in post-war figure skating history (and we all know no singles skater save Plush has the longevity of a pairs skater).
I'm on the "too soon to say" camp for now. I just hope, if Plush returns, it will be because he sincerely wants to for himself and his fans, not to "show" the stupid hostile journalists. Completely horrendous reporting and a shame to the profession.
Anyway, let's wait to see what Plush himself says. His agent also said he'll stop competing after Vancouver iirc, and we know where that went.
I think Plush just really didn't want his competitive life to end the way it did. At the same time, it was almost... inevitable. Plush is so driven and determined that he'll keep going until he can go no further... and now it seems he'll still keep going. Maybe, he just wants his final competition to be something more than a "WD," in which case he'll compete for one more season, get a rematch with the young'uns, and be done with 2015 Worlds. I don't think he'll be too competitive if everyone else skates clean (too many things to relearn/unlearn with the COP system), but he can sneak in for a medal if others fall over.
...surely he isn't thinking of going until 2018? That would simply be insane. However, I admit a tiny part of me wants to see it. It doesn't matter if he's quadless by then and comes in 18th. Just attending a fifth Olympics would be a record. And if they tweak the judging system by then: namely, make combinations more valuable and punish falls harder... But it's a real bad idea health-wise.