I've pointed out many times before that you've misunderstood the economic analysis, but the fact is that the assumption was always, as Cameron had promised, that A50 would be signed immediately on the Leave vote. That this was legally impossible was, of course, not something he cared to mention, but that doesn't change the point. No deal is economically damaging, as everybody accepts and everybody knows. This is why May has foisted such a rotten deal on us, because she had no choice if she wanted to honour the referendum on the available timescale.
As to whether or not we'll stay, it against come down to the referendum result. The correct way to honour that result is to try, earnestly, to implement its decision. Only when it becomes clear that doing so is disastrous and unacceptable could it become palatable to Remain after all.
This afternoon, apparently, will be very important. Hard not to stare.