I don't disagree, but this is a very risky move in the primaries. It could help him in the general, but he has to get past the primaries to get to the general. I think this comment was ill timed. The only saving grace potentially is that America's attention spans are razor thin and he can overcome this.
With the competition as cut-throat as it is, I strongly doubt his rivals (and their SuperPACs) will let anyone forget what he said. If I were a Republican running for the nomination, I certainly would not let that comment sink into oblivion if I thought airing it repeatedly would help me politically.
He'll pay dearly for saying it, rest assured.