Right, let's look at this logically.
The number of people who voted leave in the referendum amounts to about a quarter of the population. A sizeable minority for sure, but still, they are outnumbered about three to one. That includes people who have now changed their minds (not a huge number, but there are some as this thread shows), a lot of older people (who somehow I can't see going on EDL marches and smashing shop windows) and a lot of other perfectly nice, normal, civilised people who might want to leave the EU but would sooner sprout wings and fly than join the far right. So the number of people we are talking about is, in reality, not as large as some would have us believe.
Secondly, you seem to be looking at this from the point of view that cancelling Brexit means lots of people are very angry and move towards the far right, whereas going through with it means we stroll towards the sunlit uplands and everyone is happy except a few remoaners still chuntering away about orchestras and their children's right of free movement being taken away.
I don't share your vision of what Brexit is going to look like. I think it is going to be properly shit for a large majority of the population. I believe there will be wide scale job losses, hitting working class people in places like Sunderland and Derby and Grimsby and Port Talbot particularly hard. If we leave Euratom (which is currently on the cards) then a lot of leave voters are going to find their access to cancer treatment curtailed because we can't import the necessary radioactive isotopes the way we do now. I believe supply chains are going to be severely disrupted and people will start to panic when the supermarket shelves are running low on stock or they can't get their prescriptions filled. The pound will take another nosedive, pushing the price of almost all goods up even further.
You might call this "Project Fear" but I call it "Project Reality". And that's why I find it hard to get worked up about the idea of people lurching to the far right. I think we are kind of fucked either way for the foreseeable future, but political movements come and go whereas crashing out of the EU will create severe, long-term disruption and deprivation which will affect us at least for the next generation and may well be unfixable.
As for your threat to vote for Tommy Robinson (or, to give him his real name and not the cheeky chappy pseudonym he created to appeal to the man on the street, the millionaire Stephen Yaxley-Lebanon), I'm curious about this one.
Will you join the far right if we end up leaving with Theresa May's deal, or if we decide to leave with a soft, Norway style Brexit, or will you only do it if we don't leave at all? What would be the trigger point for you?