I could only see a very mild version of this happening.
More realistically, they could just spin up an alternative alliance between US, Finland and any other willing current NATO member (but excluding Hungary). And over time move more and more importance to this new NATO++, and perhaps even eventually drop out of old NATO.
There's no provisions for kicking countries out of NATO. But everyone else leaving the club is equivalent to kicking one country out.
More realistically, they could just spin up an alternative alliance between US, Finland and any other willing current NATO member (but excluding Hungary). And over time move more and more importance to this new NATO++, and perhaps even eventually drop out of old NATO.
There's no provisions for kicking countries out of NATO. But everyone else leaving the club is equivalent to kicking one country out.