You seem to have confused something that changes 5 years max for something that takes a lot longer for change.
For example, if we decided to abolish the Royal Family, would that be voted on the same basis? 52% of voters who could be bothered, and 26% of the population, to end 1000 years of history. Can we change it back 5 years later?
In my golf club, constitutional changes need either 67% of the votes or 50% of the electorate. It gives a bit more constitutional stability ...
And as I like constitutional stability, I am not one of those who would like to reverse what has been done now. That opportunity has passed. But hopefully lessons have been learnt, like they always do ... not!