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Sure - but to the people that they'd actually have to placate were article 50 revoked, I'd have thought that blaming the Scots / Germans / People from That London / whatever would probably be a relatively easy way to say "we wanted to do it, but were thwarted".
Anyway, I mean that you should be able to sell revocation as something other (optically at least) than an action of total weakness.
No matter what you'd be planning or 'war gaming' with, every (rational) plan up to that date would have revocation as the last minute, doomsday scenario.
You could blame it on whatever you wanted - on Labour for not supporting the Will of the People properly, on the SNP or DUP for the same, on the EU for not negotiating in good faith and for imposing punitive exit conditions - anything. I'm sure you could make it palatable enough.
You could easily say that they're acting irrationally already, but I'm not sure if they are or if they are just following other priorities which will become less important as we come up to Brexit day.
At least I hope. I'm flying out on holiday on the 12th, initially booked to be a couple of weeks after Brexit day :(