Re: dot UK doomed?
But Irish unification would.
Any Hard Brexit is going to make that far more likely. (Whether it's May's deal, Labour's mythical Turkey with a veto deal or Thelma & Louise exit.)
Scotland leaving would end Great Britain.
If Scotland left first, then the United Kingdom of Britain & Northern Ireland would be viable then the United Kingdom of England and Wales.
If Northern Ireland goes first, The United Kingdom of Great Britain would sound stupid, and be a huge irony.
Of course, not leaving the EEA is likely to avoid imposing all these issues upon ourselves.