I am not a leaver and certainly not under the current proposal. However the black/white Panglossian view of the EU that ultra remainers have is as ‘thick’ as the little Englander leavers.
But let me just put a few points forward:
The EU is intimately bound up with the Euro. If the Euro fails, so does the EU, and the Euro will fail. I cannot tell you the timing but it is inevitable. The only currency unions which have succeeded have had a unified fiscal policy and huge transfers of actual money from the richest areas to the poorest areas (the U.S for example). This has only really worked where there has been a common language and culture (the reunification of the East Germany and West Germany, for instance).
Right now, the majority of the Europeans believe the EU will fail by 2040. There has been a recent poll on this which I can link to if you have not seen it.
The ‘citizens of everywhere’ vs the ‘citizens of somewhere’ argument resonates with a lot of people. They identify as culturally British with an allegiance to their nation. They would not (and could not) transfer to Paris, Frankfurt or Singapore tomorrow and eat in the same restaurants, send their children to the same type of schools and do the same jobs. The ‘elite’ (for want of a better word) fail to understand this. They feel our culture is being irreparably diluted by a rapid wave of immigration. I get this argument.
If we ‘fell’ out of the EU without a deal, Trump and the Chinese would love to do business with us. This would come at a cost, it would not be done out of magnanimity. However the EU could clearly be put on the back foot by a mischievous Trump. The reality is that the EU would have no desire to stop trading with us and push themselves into a recession. Within weeks of no deal we would have some sort of deal.
The nations of the EU also need to borrow money regularly and they could not replace the City quickly. Paris and Frankfurt just could not ramp up their infrastructure that fast so, in the short term at least, they need us.
I think we should revoke, personally, but a good negotiator could get us far more than the pessimists on this thread believe.