Brexit is bad for the UK but it is especially bad for Northern Ireland. Today the border between the north and the Republic is a porous border between two EU nations, crossed casually either way by the Irish every day. The problem is that if it becomes a hard border between the EU and the non-EU UK, it will interfere with Irish life tremendously and raise the tensions that have been in check since the Good Friday Agreement. Another option would be to have an open border in Ireland and a special arrangement between Northern Ireland and the rest of the UK, but that raises just as much problem for those fiercely dedicated to NI remaining in the UK.
So basically, it’s a mess, and given that the UK can’t even figure out how to remove themselves from the EU on any front, never mind while keeping the peace in Northern Ireland. So here we are, England causing problems for the Irish again.
Given the anti-Brexit feeling in Northern Ireland, I do think that Brexit makes Irish unification inevitable (though I don’t think it would happen anytime soon). Perhaps Northern Ireland and Scotland should band together to form a new nation within the UK and get the hell out of the utterly dysfunctional UK.