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Is it though?
1) We can't know the number without another referendum, so we can only go by that at this point.
2) And if we did, then okay: 45%. Or 40%. Or 35%. But at what point do you find it reasonable to dismiss the results of the referendum and the n% of people both democratically and emotionally invested in it?
3) And if you are correct and the majority has diminished (and I hope it has), then this is more reason (from a remainers perspective) for a second referendum, not less.
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As of 2018 (below), and theres quite a few polls / studies ot coroborate polling trend.
But at what point do you find it reasonable to dismiss the results
Well fuck FPTP firstly. You can't expect a convincing victory on such a marginal majority. Yes there is an incredibly slim majority of voters who wanted to leave but for all intents and purposes we were left with an electorate split almost squarely down the middle (17.6 to 16.8million).
Use of a supermajorities threshold is well practiced in democracies across the globe, and for very good reason. I can think it would have been especially prudent on a binary vote where one of the options involves a state of change.
Is it though?
People have died.
People have reached voting age.
People have found the brexit on offer to be at odds with what they thought they were voting for.
Some voted to stick it to the man rather than actually vote to leave.
Even just looking at the original 52%, a significant number are remainers now, and a lot of the rest aren't "leave at any cost".