From Bozo's pontification at the Conference today...

"It would mean that UK business and industry – the entire UK economy – would be exposed perpetually to regulations that might have been expressly designed, at the behest of foreign competitors, to do them down.
It would mean that whatever the EU came up with, banning the sale of eggs by the dozen, banning diabetics from driving, banning vaping, whatever – and all of those have been at least considered by Brussels in the last few years – all of this nonsense we would have to implement with no ability to change or resist.
This is not pragmatic, it is not a compromise. It is dangerous and unstable – politically and economically.
My fellow Conservatives, this is not democracy. This is not what we voted for. This is an outrage."

The best way to deal with 'Whatever the EU comes up with' would be by Remaing in the EU, and being part of the discussion process (not forgetting that the UK is in the exalted position of being one of only nine member-states who have the power of veto). That's what a proper, mature nation should and would do - not throw a hissyfit, grab the ball, and run home with it.