It could be, because there does not seem any way forward. She is caught between the Irish Border, a split cabinet, a fractured party and no real plan that has any chance of getting past the EU or the Commons, either or both. But whether you like her or not, May is a fighter and she does not give in, so no predictions.The mess is now so great that there are three options only over Brexit.
The first is to agree a deal which leaves the country at large undamaged by staying in the single market and the customs union, making the contributions and sticking to the rules, enjoying free movement and if not full, associated citizenship of the EU. This would leave the country undamaged and the politicians punished for what has been described as a shocking failure of statecraft, for they would be excluded from everything. As soon as the millennials get themselves into parliament, we would go back into the EU as full members.
The second is to call the whole thing off and ask for the Article 50 letter back, citing more time to focus as the excuse. In the end the flawed and false vision of’Global Britain’ would fade and be forgotten.
The third is to hold another referendum with all the known options and costs in jobs and living standards spelled out. That will settle the matter.