The thing is, there is absolutely nothing Corbyn could do to please some people, and the same would apply to whoever else happened to be in charge of even a homeopathically left-wing Labour party that listened to its own membership or offered any alternative to the status quo.
Think about this suggestion: there really is no fairer offer that could be made - a strictly time-limited (we're talking about a matter of weeks) government of national unity to put the matter to the public once and for all - "Do you want a no-deal Brexit and all that that entails?"
If the Conservatives then win the general election, Corbyn steps down as PM and we get the no-deal hard Brexit that Johnson and and his crew wanted all along. If that happens, fair enough, it's what people want.
If not, then no-deal is off the table and whoever forms a government has a chance to renegotiate the withdrawal agreement and then put that to the public against sacking the whole thing off and remaining. Once again, the people get to decide.
This is exactly what the Liberal, right-wing Labour and Conservative remainers have been asking for all the time, but still they won't have it, because it's Corbyn - who, let's not forget, is the democratically elected Leader of the Opposition and according to what passes for our constitution has first dibs on it - and not some time-serving centrist "grandee" like Clarke or Harman who the editor of the Guardian has pulled out of her arse just because he or she does agreeable lunches with journalists. That's not democracy, and it's precisely what caused the problem of disillusionment with democracy in the first place.
These are serious times. If the LibDems, Tory remainers and what's left of Chukka Umunna's mob really are as serious about stopping a headlong rush to a hard Brexit as they'd like us to think, then they need to stop fucking about playing party politics and get behind the only serious, democratic way out of this mess, one way or another, that's left on the table.
But I suspect they're more interested in keeping their seats and would happily tolerate no deal rather than getting kicked off the gravy train.