I can't see any resolution on the Irish border question that would please anyone. May is doomed and probably so is any deal. It's going to be a hard Brexit.
It's a mess but I've got more faith
The big EU players are going to start putting overt pressure on Ireland pointing out how bad a hard Brexit is for them (even worse than for us) and how much they need the big EU players on their side if Ireland is going to continue to get its gift horse a day position in the EU.
May would be smart to start talking with rather than at the Irish but if she doesn't then her survival depends on Corbyn and him not forcing a vote on Hard Brexit. He'll just choose his moment.