Just a humble guess, but I think the last card remaining...that might be dealt...Parliament might try to pass something requiring the general public to vote on the deal, in order for it to be accepted. In this case, you’d need at least six weeks to get the measure in some form, and have a national vote on this. Macron and Merkel might agree to a 90-day extension, to allow that vote to occur.
I don’t think it would matter too much....probably over 70-percent of the country would vote the deal down, and then you’d have absolutely nothing left on the ‘plate’.
Deep state tactics. Keep holding votes until you win, then declare the matter settled for all time.
Keep counting votes until you are ahead, then declare the counting over.
It internationalists are going to do everything they can to stop Brexit. They don’t care who among the proles gets hurt.
Parliament could only ask for a delay. Unless it wants to scupper Brexit by demanding Johnson request an Art. 49 revocation, the UK will still leave in the next ten days.
That’s what the Remoaners really want but they don’t have the votes for it. If they did, there would be no Brexit. All the rest is Kabuki theater.