Blatter won't go because everyone supporting him are bound up with him.FIFA is self appointed and should be ditched as an organisation. They only survive because national FA's do not have the collective will to ditch them. A case of better the Devil you know I guess. No, Blatter is all powerful. The only way he'll go is if removed by some police body for a serious crime. I think why nobody takes any actions is because everybody else probably has something they want to hide too. Lots of glass houses out there.
Bodies such as FIFA, UEFA, the Olympic committee are in essential private multi-national businesses and FA's and even nations are in reality clients. Therefore no one can enforce independent scrutiny of their dealings. This gives enormous scope for financial and political abuse. That isn't to say that is happening, but I let everyone make their only judgements on human nature of people in positions of power and influence. For instance ask yourself how many altruistic people you bump into yourself in an average day.
I've always called for other large organisations, such as the media, to embarrass the soccer authorities into cleaning up their act. This is because if they aren't they will not.