Elendon I would dispute that, to be honest.
I don't doubt that some Leave voters would have continued to complain, loudly, and I don't doubt some of the factors that led to the Brexit vote (concerns re levels of immigration, lack of democracy) would have continued to raise their heads, but in terms of accepting the vote to stay in the EU, hypothetically, would have been accepted?
Why? Well - if the statistics are correct and those with lower markers of educational attainment were more likely to vote Leave, we can deduce from that these are people more likely to be from what we can roughly describe as a working class background, and in those cases they are more likely to be used to political disillusionment. The biggest battle UKIP faces for example is not tempting Labours core voters away from Labour but getting those voters to see their vote can make a difference.
All the above is a general not specific point. I know there were numerous people with degrees in professional jobs who voted to leave (I am one of them) but since we have repeatedly heard the leavers were made up of the white working class, let's assume that's correct - the white working class are quite used to being misled and being unrepresented in government. I doubt they would have been moaning and groaning and wailing and shrieking.
The opposite of this therefore is the professional middle classes - those non racist, non xenophobic, tolerant and open minded. It also just so happens they are very used to getting their own way, to loudly objecting when things don't go their way and are accustomed to making their voices heard.
Furthermore, most Leave voters (including me!) fully expected the vote to be to remain. I suspected it would be a close one but anticipated it would fall on the side to Remain. The result was a surprise to me!
Lastly, if we assume all the above is nonsense, and while I think there are some accuracies the above points are too general to have any real substance - many Leave voters voted due to concerns about democracy, or lack thereof, in the EU. If we deduce from that democracy is important to Leave voters, they are hardly then likely to become too shrill about a democratic process.
For my part, I voted Leave in June and I would vote Leave again. No one I know has changed their minds, but then most of the people I know are vocally 'remainders'.