Interesting. I'd be looking elsewhere but perhaps not quite as quickly.
Just from my own perspective living here, I think that Slovakia, a country that borders Ukraine, is a very useful airstrip for the US. Not indispensable or even well-known but very useful for its unassuming yet strategic location. I vaguely know people from the American intelligence and armed forces community who live here and get a small picture of what, hypothetically, might go on here behind the scenes.
So I personally don't see the USA abandoning a strategic listening post and it wouldn't really be possible for the USA to leave NATO but keep all of its installations unless it elected a fascist tyrant. But that's not exactly unrealistic at the moment. Unfortunately.