All this depends on what happens to the UK economy in the wake of the Brexit. It also depends on if this actually occurs (Article 50, I do not believe, has been enacted yet). Then again, even if it has.. the article really only forces negotiation on the EU side (although, not the UK).
Basically, everything is still up in the air. That all said, since I no longer live either in Europe or the UK.. I've only paid passing attention
True enough, but just on the face of it, if Scotland goes independent and keeps the budget where it is right now, the average increase in taxes to the Scottish will be about £2400 per annum per person. And if, like the US, 47% don't pay any taxes, that will effectively double on the folks who DO pay taxes to £4800 per annum per person. So a family of four whose income earner pays taxes will see an increase in taxes of about £8000-£16000 per annum. Or Scotland will have to make serious cuts in domestic spending much like Greece did. Based on that analysis, I'm not sure EU will accept Scotland as a member. Germany doesn't want to have to finance another Greece.
So basically, if Scotland departs UK, then the tax situation will get very interesting, even if England's economy goes down.
Oh, and the taxpayers in UK will be better off because they have stopped subsidizing both the EU and Scotland. I read that UK is now contributing £20bn per annum to EU, and from the article I cited the net deficit to Scotland is £12bn, so the savings to the UK leaving EU and Scotland declaring independence will be £32bn/annually. That's about £533 per person per annum. So, a family of four in Scotland will see taxes increase by £8000 - 16000 and a family of four in UK will see taxes decrease by £2200 over that same timespan.
I don't live there either, but I don't think the "doom and gloom" predictions are valid, and I don't think, presented the numbers I just showed you, that the Scottish are willing to give up that much just for Scottish independence. Maybe they will, but it won't be a coldly logical decision. It will be nationalistic. And it will cost them dearly to make the move.
EDIT: Corrected a math problem...