What have English, Welsh and Canadians got to do with this? It's a Scottish issue. Let them make their decision, and then live with it. No-one else's business but theirs.
FWIW I think they will (and to some extent already have) crucify themselves, but it's their right to do what they think is the right thing to do. Not England, Wales or Canada. Or Ireland or the US.
Leave them to it.