[johannes1234321]

It's not neccissarily "their best interest" for one as there is no objective "best."

A key difference is that in Norway and Switzerland the "political elite" is pro-European and often wants closer ties up to joining, in UK however the brexit is the culmination of a decades long "RU/Europe/Brussels is evil" campaign and the British government gives little reason for the EU to believe in good reason for their negotiations.

[pjmlp]

Well lets see how it turn in the long run, because as of today it doesn't look that good.

I am aware of companies that have done actually this, splitting UK and EU sites into two separate business entities.