More likely. Though, that doesn't exclude the risk of lost peace for Scotland or any other former country of the UK if the UK dissolves.

Old grievances have a way of rising to the surface again. That's just the way it is. Collective memories are long. England was not kind to the Irish or the Scottish historically. I would guess that applies to Wales as well.

Look at what happened in the former Yugoslavia.

You're not wrong to be concerned about loss of peace.