I don’t plan to leave, but I’ve started a “get Irish citizenship” project. It should be relatively easy, as I have a grandmother born in Ireland. I need to get on the Foreign Births Register, which involves getting all the relevant birth, marriage, and death certificates. Once on the register, I have citizenship. If I then get a passport, I would have free access to the EU, of course.
My reasons are, in order, 1) it would be fun 2) I can 3) (distant 3rd) I’ve got some places I could potentially go if things really turn to sh*t.