Why are you so sure about that? Only a few posts ago you said you hope for "closer relations with the EU". Scotland leaving the UK would be a huge excuse for the UK government to say that they are staying outside the EU but re-joining the single market to make the new relationship with Scotland work. As it stands at the moment, Scotland don't get independence, they lose free movement and are out of the EU. There has to be some compensation for the Scots.
I think it's blindingly obvious that the Brexit negotiations will be a Sunday School picnic compared to the acrimonious chaos that will result from trying to unravel 300 years of extremely close relations and agreements, most of which aren't in writing. The Tories made ending Freedom of Movement a massive big deal in the Brexit negotiations, and have withdrawn from everything that requires FoM as a condition of membership. This has clearly gone down well with English voters who view it as a victory, and all I can see is the mother of all standoffs between the SNP and the Tories. There's no way the current government in Westminster would back down on that, Brexit is all about controlling immigration and doing independent trade deals, and they'd throw Scotland to the wolves rather than compromise on that. Add into the mix the SNP's determination to play the victim and act hard done by, and that's a toxic can of worms I don't even want to open.
I do want closer links with the EU again, but I think they have to evolve UK-wide over time, as people come to recognise the benefits they will bring. There's no way you can just force the issue, and expect England to give up everything they've supposedly fought for.
If a (legitimate) Scottish indyref is held, I'll have to accept the result, but I'm of the opinion that independence will be much like Brexit - an enormously acrimonious and damaging process that will bring precious little gain at enormous cost. I can't face it, to be honest.