Originally Posted by
caervek
It's not an assumption it's a foregone conclusion, hence why the Brexiteer politicians are so dead set on avoiding a confirmatory referendum at all costs, because they still can't believe the fluked the first one and know they have zero chance of a repeat.
To put it in perspective, in the 2016 referendum the results were 51.89% Leave, 48.11% Remain, a Leave majority of 3.78% in favour of remain. If another vote was held today but only people who wanted to vote in 2016 were allowed to vote, and none of them had changed their mind, then it would be a guaranteed Remain victory due to the amount of voters who have become old enough to vote since 2016 (mostly Remain supporters) and the amount of voters who have died since 2016 (mostly Leave voters).
But it doesn't stop there, since 2016 many people have changed their mind and the vast majority of them were Leave voters, one of the biggest reasons for this is that they have since realised they were lied to during the campaign and the Brexit being pursued by Leave politicians is not the one they voted for. To put that in perspective, Boris and pals did not campaign for a no deal Brexit, they campaigned for withdrawal from the political union of the EU while remaining in the single market, because of that the vast majority of Leave voters who voted for that version of Brexit have since become Remainers as they never wanted to leave the single market and the Brexit promised to them is no longer on offer.
And it doesn't stop there either because as is well known a referendum on change always favours the change, people are less likely to come out and support the status quo because they see it as the more obvious/stable choice, and this phenomenon featured highly in the 2016 result with turnout much lower among Remain supporters (part of which can be attributed to the actual Remain campaign giving the impression it was a no brainier). That would not happen twice now people understand that the outcome isn't foregone.
So you see, a second/confirmatory referendum wouldn't be a case of who would win, but how much Remain would win by, that's the reason Farage and friends are so terrified of the prospect even when they like to claim they would win anyway.