The creation of 'Northern Ireland' (sic) based on a gerrymandered border, in order to leave a Protestant majority in power, was a political act which led to 80 years of often bloody conflict.
Asking that gerrymandered (then two-thirds, much less now) majority whether they would like the situation to remain the same would achieve - what exactly?
They could, of course, ask the population of whole of the Province of Ulster (the only valid historical entity) whether they wished to be Irish or British - but I can't see them any more prepared to do that than they were in 1922 - can you?
Incidentally, in answer to the question "what now", the press this morning is full of suggestions, including putting those responsible on trial, (as you would any murderers and perjurers, no matter how long ago their crimes were committed) and even involving the Hague War Crimes Court - take your pick.
Jim Carroll