Cut to the end, having read half!
No, there wouldn't be rioting.
The few Brexiters I know have taken no interest whatsoever in what's been happening over the past few months. Any mention brings cries of 'I wish they'd just get on with it!'- to which, naturally, they're asked 'What? Get on with what? Under which terms? FOM? SM? CU? Norway? Canada? WTO? Cliff-edge?'.... cue much confusion. They're unlikely to take to the streets because their reasons for leaving were so inchoate I doubt they'd know what to put on their banners now they realise how asinine it was to allow the great uninformed vote on such an important and complex thing.
However, I also suspect they will declare 'victory' if we end up with BINO, having only a rather critical loss of any 'say', of any influence at the top tables of the EU to show for their 'Brexit'.
I believe that vast majority of Brexiters voted for the first time ever, and many, thankfully, are refusing to ever vote again. Many now have a vague sense of how badly they were mislead, and I believe many would be grateful to have the folly of their vote being over-turned without loss-of-face and without being forced to take any blame (see how many are already back-tracking, or, if in government, resigning as the scale of the potential shit-storm becomes apparent).
Most Brexiteers weren't voting against the EU, they were voting against austerity and the Tories. I think many have woken up to this (at least, I hope so, unless there is some truth in the allegation that 'Leavers are stupid'...), I believe many, many were as shocked as Remainers at the result and would rather like to see the status quo continue, but with the Tories having had their noses bloodied.