The shit will hit the fan if there is no strong majority. And all the polls suggest that it is not going to be a strong majority. 50% of the population is going to be pissed. Too many bridges between both side have been burned.
United will only be in the name of the country after today. This is the beginning of years of trouble ahead.
Shit had already hit the fan with the Scottish referendum and the SNP wipeout at last election. The country is split between haves and have-nots, the globalization winners in cities and South and losers elsewhere; the have-nots are easy prey for nationalisms, as it's always the case.
United will only be in the name of the country after today. This is the beginning of years of trouble ahead.