I don't like Smash Bros. type of games.
And I don't see why you would want Sony to whore out their IPs as bad as Nintendo does.
I mean, they already made PlayStation Move Heroes, wasn't that annoying enough?
I suppose it IS possible, they have have a good enough line-up:
Kratos, Nathan Drake, Ratchet, Clank, Jak, Daxter, Sackboy, Sly Cooper, Cole MacGrath, Nathan Hale, Sweet Tooth, Rico, Sir Daniel Fortesque, the Patapon guys, the LocoRoco blob, anything from Team ICO's creations, ...
But no, I wouldn't be interested. (Besides, it would be pretty problematic: Nintendo is notorious for keeping 95% of all its franchises PG, while Sony has a player in every degree - to gore or not to gore?)