I like Iwata. I don't know if he has the know how to dig Nintendo out of their current position without doing the things they most definitely do not want to do, but I'm not sure many/anybody does. But I like him. I like listening to him speak. I am convinced he comes from an honest, software quality first place. And I think he has a good head on his shoulders for keeping the games fun at Nintendo.
If he were to resign, it would be nice if he stayed on, at the very least to host Nintendo Direct. I like him as a face of Nintendo.