Here's the situation:
A dual citizen American-British couple lives abroad (i.e. in the U.K). Because of the burdens of U.S. worldwide tax (the only country that does this besides Eritrea) the husband decides to renounce his U.S. citizenship so that he won't be doubly taxed on his income, sale of his home, etc. The wife and children however maintain their U.S. citizenship with the idea that should they ever wish to move back to the U.S., the husband can accompany the wife and obtain status (i.e. green card) as the spouse of an American.
Are there any rules that would prevent an ex-citizen from returning as a spouse? Form I-130, the Petition for Alien Relative, makes no mention of ex-citizens, but I wonder if anyone knows of any hidden rules or precedent for this sort of situation.