It’s not just the US though. The European powers are far more firmly committed. It’s not at all clear that the rest of NATO will simply walk away if/when the US does. Especially the former Soviet nations; this is not a fucking game to them. The loss of US support would be huge, but I don’t see a universe in which the Europeans just roll over for Putin once the US loses interest.
I downvoted you for being a condescending piece of shit. Can’t speak for others. There was a way to make your point without being a condescending asshole, but that’s not what you chose.