I have just listened to Gus O'Donnell, former head of the Civil service, explaining that it was essential that no deal is taken off the table.
He explained that the EU may, at the eleventh hour, make some minor concession which would enable Johnson to come back waving a bit of paper and urging everyone to vote for his fabulous new deal, otherwise the default was no deal. The ERGs and other brextreemists would still refuse to vote for it. Why should they? No deal brexit is what they want.
He is a crossbencher in the House of Lords and if legislation to prevent no deal gets through the Commons, he and many others in the Lords will do their all to make sure that brextreemist peers cannot sabotage it. So there is still hope this disaster can be averted.