I think that at this point, Northern Ireland leaving the UK / Irish reunification is certainly conceivable, and more likely than Scottish independence.
I believe that support for Scottish independence was only at 28% when Cameron agreed to hold the 2014 referendum (thinking that there was no chance of him being on the losing side), before it briefly held the lead 10 days or so before polling day. I gather that a lot of people who voted for the SNP during their landslide win in the 2011 Scottish elections, actually opposed independence. The issue surfaced again due to Brexit, with more people voting to remain in the EU than leave in all 32 Scottish council areas (it’s fair to say against that backdrop that overall Scotland was dragged out of the EU against its will), alongside Scotland consistently being lumbered with Tory Westminster governments that they don’t want. But the recent SNP chaos looks to have severely damaged support for independence.