If Brexit ends up being forced through on the basis of a deal no one supports - indeed a deal so bad that the PM has to promise to resign to get it through - it will make an already bad project even worse.
Of course, the logic of Theresa May’s assertion that Parliament’s indecision is frustrating the will of the people is to put the issue back to the people and let them decide. If she is confident that the people back her, what’s stopping her?