"Scotland is all but certain to leave."

Not a certainty at all, especially if new EU membership involves taking the Euro. There is a reason Sturgeon has not yet called the vote, they know that EU joining terms are likely to be very ugly for Scotland at this time. She first has to convince the EU to give them extremely exceptional rules (or legal challenge so Scotland isn't necessarily leaving then joining).

Your statements are hyperbolic. No one has any clue what is going to happen next. Making these assertions is unhelpful to everyone.

But. If you truly believe in what you are saying, now is the time for you to make yourself millions of pounds in the next few months easily. Plough your savings into the market, take large, leveraged positions against the UK.

The Euro thing is kinda false. Yes, new countries have to adopt Euro but there is no deadline and no penalty. They only have to promise to do it someday. That is why some countries don't have it and will no have for many years.

But Scotland doesn't have its own legacy currency. There's no need/excuse for a phase out period.