As a eurosceptic this is an unexpected Godsend, but not one that I expect will derail the EU project.
Already there are voices from Brussels suggesting that the treaty can go ahead without Ireland and Jose Manuel Barosa continues to act like the EU is a state rather than a treaty organisation.
Doubtless we'll have 26 states ratify the damn thing and then some backroom deal or other will get the provisions though in Ireland in a form other than a constitutional change, and the damn federalist agenda will roll on undeflected.