I'd be very surprised if they changed Tiki Room BECAUSE OF THIS, that being said, they should change it anyway. I agree that Gilbert Gottfried is and will always be Gilbert Gottfried, which means he will always end up making a possibly offensive, off colored joke about something. So long as he doesn't make a comment about Disney, I'd be surprised if they did anything about it. I agree with others that Aflac probably overreacted, but I'm also one of those people who didn't know they did a lot of business in Japan.
Also think of it this way, he's not just a voice in Tiki Room, he's part of the whole Aladdin franchise and he will always be associated with it, there's no way Disney could disassociate themselves from him. And if they did, they'd be a bit hypocritical. Think about the backrounds of Robin Williams and Tim Allen, they aren't exactly squeaky clean either. As far as Disney is concerned, they aren't going to fix what isn't broken with this.