I don't think we'd necessarily benefit from a massive u-turn, but I think many leave supporters are disgruntled at what it has now been revealed they were convinced to vote for.
So maybe riots, but also quite possibly not, and not necessarily (as it was put elsewhere in the thread) because people are just rolling over and taking it...
I can imagine a lot of people threatening riots and outright civil war, but the British right isn't organised enough to do much except march around being loud and annoying and picking a few fights with foreigners.
It certainly isn't intelligent enough, or well-armed enough, to have any hope of winning an actual civil war.
The only case worse would there being riots, and the government rolling in and declaring some form of martial law while no other nation lends a hand or steps in to sanction the ruing government.
This would prove that either a) the citizens of most western nations will no longer fight for things they believe in, or b) they can no longer fight for what they believe in and no one will aid in defense of the values that western people hold. That's a scary state of affairs.
In my opinion either of those outcomes prove it's ok for any ruling class to bully around the majority and that no one, not even in the international community, will provide them any faults for doing so.