I don’t see that US leaving NATO would actually harm their hegemony. It might even strengthen it because US will no longer have direct obligations to Europe, that means Europe will be forced to beg US for help in case of a crisis as opposed to take it for granted.
But they also wouldn’t be bound by any decisions NATO makes, and given that they comprise the bulk of the military might of NATO, it’s going to be a toothless alliance without them. So, at the end of the day, Europe would have to come begging US for protection.
I don’t see that US leaving NATO would actually harm their hegemony. It might even strengthen it because US will no longer have direct obligations to Europe, that means Europe will be forced to beg US for help in case of a crisis as opposed to take it for granted.
The US wouldn’t really have the veto capabilities on NATO decisions like they currently do.
But they also wouldn’t be bound by any decisions NATO makes, and given that they comprise the bulk of the military might of NATO, it’s going to be a toothless alliance without them. So, at the end of the day, Europe would have to come begging US for protection.