Re: Why would the ESA want this?
They should never have let May anywhere the negotiations.
This is an interesting argument from someone in favour of leaving. Isn't it just a strawman suggesting that the reason there are problems is because we don't have the right leader? Or do you mean only "true believers" should be involved? If so, well, Davis is leading the negotiations and making a hash of it. It's great when you've always got something else to blame as this also means never having to take responsibility. But claiming that it would only work if only the right people were doing it is more of the wishful thinking that was pushed in the referendum: ultimately successful but also responsible for the situation as it is now.
Those of us who argued against a referendum in the first place and against interpreting it as an instruction to parliament argued precisely along these lines: the referendum should never be interpreted as policy and if so, it could only fail because the terms of leaving the EU were never the subject. Unfortunately the constitutional arguments were always bound to be drowned by the populist claims from those who want to travel but never arrive.