Good. That this at all happened should make them think about relocating to a country like Switzerland. They're supposed to be an international organisation.
I don't think that's a major issue as the EU isn't very coercive when it comes to these types of institutions. Has Switzerland ever coerced an institution into behaving the way the IEEE just did?
that really depends. It could be easy or hard depending on how things are structured.
The hard thing could be any trusts or past agreements IEEE has made that depend on US law. Like they could create a swiss organization, but could they legally move certain forms of existing funds to what techically is a seperate organization. Like really only the IEEE knows how hard it would be to do.