The market is shrinking massively with Brexit. An independent Scotland would more than likely get back into at least the single market after a while. I strongly doubt rUK would cut off all trade with Scotland.
What 'market' is shrinking massively with Brexit?
What 'market' are you referring to?
Markets will open up post Brexit as we will be free to do our own trade deals with the 150 plus other countries who aren't in the EU and have already said they are open for business, right across Asia, the Far East, South America, the Commonwealth.
And an independent Scotland may or may not get back into the 'single market' eventually. That same 'single market' that represents just £12bn worth of trade to Scotland as opposed to £50bn worth of trade with the UK. And what will it be doing while it is trying to get back into the 'single market' it sets so much store by? 'After a while' you say. What two years, five years, how long would Scotland be waiting to 'get back in' as you put it?
And you 'strongly doubt' (that old crystal ball gazing again) that the UK would cut off all trade with Scotland. How do you know how the UK would react post Brexit and post Scottish Independence? Once again, the UK market is far more important to Scotland than the Scottish market is to the UK.
Every single thing in your post is speculative. If you read back through this thread and what has been discussed today you will see hard facts and figures as to why it is in everyone's interest, despite the bluster and name calling for the UK and the EU to do a deal. The UK market is worth far more to the EU, than theirs is to us.