Considering the plans Paizo has announced for replacing their backend financial system, upgrading their online store, replacing their forums, and improving their warehouse situation I'd say the number of people that stuck with them is a good amount. Morrus has said on this forum sales of EN Publishing games has continued to do better than they were before the OGL situation. That doesn't mean WotC has seen much if any impact and that's pretty easy to rationalize IMO.
Despite not making the money they wanted in the theater, I'd argue the brand awareness boost of the D&D movie did a lot to bring new folks into the D&D game which ended up still being growth for WotC despite whatever customers they lost to Paizo, Goodman Games, EN Publishing, and so on. Look at the surge in Google searches related to D&D around the time of the movie. They continue to pull in new players and honestly it's pretty impressive.