They wouldn't dare if Steve was still CEO. Let's see... Apple would be out of Ireland in a week and if an Irish citizen wanted to buy an Apple product they would need to travel to the continent... and it would cost them double.
LOL Despite Apple having all those "subsidiaries" based in Ireland they don't have a single Apple Store retail store in the Republic Of Ireland. The only one is in Belfast - Northern Ireland(UK) so I have to travel 100 miles already for my "genius bar appointments".
I think Apple will leave, just as Dell did before. I can see it happening.