Mr Khan on 29 November 2011
Snake is a bad example for either side of this argument. His inclusion was actually disputed for Melee originally (where he did not get in) and the insistence that he be in Brawl came from Kojima, due to his friendship with Sakurai, and not due to any other factors. Sonic's inclusion was by overwhelming fan demand, once they knew that the door was open to third parties
At the end of the day, it would be certain that some characters with stronger relevancy than many of the Sony characters being kicked around could be introduced if Sony chooses to embrace third party input on the matter, but that would all depend on who they could acquire
Monster Hunter: pissing me off since 2010.
