Should not have to worry about US pulling out of NATO. Trump is stupid, but even he realizes that it would not benefit US in a any way. Significantly reducing funding might happen, but hopefully that will make EU countries increase their defense spendings as a reaction.
That assumes that Trump is a rational actor when it comes to these sorts of things, and I'm not sure we can rely on that.
The question is how much of his leaving-NATO rhetoric was sincere, and how much of it was empty threats to try to get other NATO countries to devote more money toward defense.
