I have a better idea. Scotland should become independent of the UK and resolve to remain within, or rejoin, the EU. Then England could consider at leisure the effects of withdrawal as and when they manifest themselves; and if in consequence its people change their minds about membership, they can reverse their decision in accordance with whatever their constitution may provide for in such a case, and seek readmission.I have an idea.
The half of England and Wales that wanted to stay should all move to Scotland
Whether they will be welcomed by the continental EU states as warmly as Scotland is of course another matter.