It sounds like husband might have already put that on the table: I'm not sure what else would be covered under "explore other options" when you've already eliminated condoms, sterilization and birth control.

If she's rejecting everything *but* him getting the snip, including abstinence, it's tough. I see both sides here. but I still have a little bit of schadenfreude every time this results in a man having to confront not having full control of his future reproductive choices

Honestly my suggestion would be that they are both currently having really strong emotions about this and maybe they should table it. Until November possibly?