There is a petition up to repeal FATCA, and you can sign it here. Current tally shows 361 signatures.
It’s doubtful that FATCA will be repealed at this point because it would make the US look “weak” (which is, apparently, what changing your mind in light of new evidence looks like??). But the US can still save face by going ahead with FATCA officially, but not taking any action to punish non-compliance – in the same way that FBAR requirements have been on the books since the ’70s without anyone really doing/knowing anything about them.
So I do think that it’s worthwhile to sign the petition. It may give the US government reason enough not to force the issue.