There are many more states that passed their amendments in the 70%+ ranges who would be a long way away from repealing their amendments with another popular vote. But there are a smaller number of states that only passed theirs in the 50%-low60% ranges in the middle of the last decade that would probably be vulnerable now to repeal. To the state, defining marriage only takes 50% +1 vote. But I don’t think they will bother if the folks in black robes keep striking them down.
Freegards
I expect the Supremes in the next year or two to require all states to recognize all gay marriages conducted in another state. Arguably, this is constitutional, based on the full faith and credit clause.
Although it is interesting that states are split on the issue of first cousin marriage, which IMO is or should be a non-issue.
Of those states that don't allow cousin marriages to be conducted within their borders, most still consider cousin marriages performed outside their borders to be valid. But there are, I think, a couple that don't.
Which would seem to be a precedent for states refusing to recognize gay marriages performed in other states. But then cousin marriage isn't a big hot button issue, though I wouldn't be surprised if there are as many or more of them as of same-sex marriages.