Looming Catholic majority in Northern Ireland
Yes, and if the British government ever gets tired of subsidizing NI on a massive scale (the place has a bloated public sector, a lot of people on welfare and very little industry left) the tacit Catholic support of the status quo might start to dwindle. Add the effects of Brexit and a hard border and a United Ireland could become a realistic option at some point.
Never underestimate the power of jingoism. That's the only sentiment more powerful in Little England than its urge to mortify the poor.