It would need to stay at these numbers for the next ten years

The number of voters believing Brexit was the wrong idea have consistently exceeded those believing it is the right idea in polling since about mid-2017. We're already 6 years into your 10.

The reason there was so much clamour for a second referendum in 2017-19 (a manifesto policy of parties accounting for >50% of the votes cast at the 2019 general election) is because the polling consistently showed Remain would have won it.