I think that if Musharraf would enter politics, it would be a fortune for Pakistan, and I do not see any reason why he should not. We have to get rid of mega corrupts like NS and others from Pakistani politics, and that could only happen if strong personalities enter politics. I hope that you may have seen the interview of Rahmat Shah Afridi, owner and editor of Frontier post, on corrupt politicians of Pakistan, and if not, please find and see them.
He didn't do it when he had power, what makes you think he will be able to achieve that by being head of thug-party who will be second-fiddle most of the time.