given it is a US company, it is doubtful they will ever pull out of US.
China... hmmm, they need manufacturing there so need to keep working there until the find a way to mass produce items with less labour.
EU does nothing but create grief. Eventually it could cause enough grief to make it not worthwhile. It is probably the easiest region. Look at the number of Apple Stores. Most are in the UK. Apple could pull stores in the EU and people have a quick holiday in the UK and pick up a phone or whatever...