One would think Miki Ando winning Worlds would motivate Joannie to come back, but she doesnt seem to care as much about the thought of winning or medal counts as other top skaters. If she is satsified with her current involvement in skating, and she seems to be, I doubt she comes back.
Evan would never come back after seeing Chan at Worlds. He would only give up his role as the star of SOI and leaving the sport on top with all major titles if he thought he had a real shot of defending his Oly Gold which for now anyway he clearly does not. Even if something happened to Chan he still wouldnt, the quads are coming back and flying, and it will only be alot more by Sochi. Moscow showed scary potential for the mens field by Sochi, even though Chan will almost certainly remain unbeatable the top 8 or 9 will be incredible.
Johnny? Who knows, it seems he might be deserpate for some extra cash considering he started his own reality show which didnt pan out well, tried selling his own book with some scathing remarks. He has burnt almost all his bridges, he has literally no touring offers. However he was never a favorite of the USFSA or international judges alike, and he never mastered COP friendly programs or the quads that are coming back. So it is not like that avenue is a particularly rosy or promising one for him either. The one saving grace for him is the U.S men seem weakish at the moment so maybe he could make a World team, and maybe that would satisfy him for now even with an inevitably mediocre result (barring major improvements) come Worlds. I dont know really.