In line with what Pam said, if something fatal does happen to Michelle, they belong to some wacky religion, so like the Dubs, i have a feeling that he would be married within the year if something happened to her, just like the Dubs do, but, the only turn-off for another woman might be "all 'dem damn kids", but then maybe it won't be.
(I'm just waiting for Jim Bob to get caught with some filthy transvestite whore)