Damien

Thankfully I doubt it's going to happen. The UK would probably be able to veto it.

If it did would the other countries find it easier to exclude the United States instead? I wonder how concerned our intelligence services are with sharing information with them at this point.

Intelligence is one of the areas where we're quite valuable to the US IIRC. Our government's lack of concern for privacy means we're used as a loophole for the stuff they are constitutionally unable to do and GCHQ know what they are doing. If America has decided her enemies are her friends and her friends are her enemies then let's see how that plays out in practice.