>Before the ruling Apple was paying about 8B in taxes per year to Ireland.

> If multinational corporations are no longer able to do a Double-Irish Dutch Sandwich anymore, it doesn't make sense to stay there.

That figure isn't going to change, nor are companies going to be running out of Ireland - the tax strategy has been shut down for more than a decade. Ireland has other features which make it attractive to US businesses, including strong historical ties and being the remaining English speaking member of the EU.