That seems like wishful thinking to me. I don't see any stretch in the establishment over any of this. I see a virtually unopposed r/w tory administration ploughing ahead with brexit. I see an SNP demanding indyref2, but so what? Whatever its result, how does that progress any 'progressive' interests? One layer of nationalism playing itself off against another layer of nationalism. The antithesis of w/c organisation - vertical vs horizontal.
There is never a wrong time for w/c organisation. But to see this particular time as in any way whatever propitious is, for me, to be indulging in a massive slice of wishful thinking. How is it any more than a time of desperately trying to resist retreat, to avoid something even worse than what we have now?