You don't think he wants to stay in Toronto? Potentially have his jersey in the rafters and possibly even a statue? Not to mention continue to get lucrative endorsement deals, his businesses (own a restaurant), grow his foundation (employ his family), big tax write off and potentially have another career in management or media afterwards? He may not like the criticism, but you could tell even before he indicated "he's a god in Toronto"... that he loves the attention.
He can play out the year and leave, but he can only sign a 7 year contract vs an 8 with Toronto. At 35 hes unlikely to get meet the same wage he does on an 8 year, especially with how slow and weak he is already. His stock is depreciating by the season, not sure it is wise of him to sign a short term deal, especially if he's going to a team where he won't have a player of Matthews caliber on his line. Or the talent the Leafs have on the pp.