Of course the problem with the second referendum is what question should be put on it.
The people who are pushing this referendum are all remainers so I would presume that they would gerrymander the question to push the result this way.
Eg if the question on the 2nd referendum is the same as the first ie "Do you want to leave the EU?" then the result would be the same as the first one.
So they would instead ask the question "Do you want Theresa Mays deal or Remain" which might well result in a remain vote.
I bet there is no way they will give a straight question offering "WTO exit" as one of two options as they would be scared sh&tless that that option would win the day.