I think you are correct and that is the only thing that the next PM can offer which is different to the current clusterfu**. It will probably be more of a trip, stumble through the exit door and fall on our backsides in the gutter type of departure rather than a planned and well managed event.
I'n not so sure, consider these factors:
Over three quarters of MPs are not only very strongly against No Deal but also scared of the prospect and its consequences.
Although the country is evenly divided on Brexit, polls show two thirds are firmly against No Deal, since even Leave promised them a deal. Delivering no deal against the majority's wish would frighten the Tories even more.
If you doubt the fear, in view of how unpopular they are now, Tory MPs are already discussing the awful prospect of a general election returning almost none of their MPs to parliament. Some commentators are even citing when similar happened to a ruling party in Canada.
Boris Johnson is one of the most treacherous characters one can ever have the misfortune to know of. He has never had his heart in Brexit. Back in 2016 he refused to declare until Cameron declared for remain. Then Johnson chose Leave since he always meant to position himself as a rival for future PM position.
So having achieved that, I wouldn't put it past him to present a deal that is virtually May's in all but name, relying on his popularity and powers of persuasion to swing the vote in a way the unpopular Theresa May never could.
So a BRINO Brexit is still very much on the cards as being easily possible, don't bet against it.
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