Don't be silly. A system like they have used in the US in the past, where for such a major decision, 60% or 70% of the population have to be in favour, for example.
It simply is not right for this sort of change to be even considered when almost half the population are against it. Quite probably more than half if the votes were cast again following this mess.
All that does is protect the status quo for ever. Nearly 4% extra voted for leave. And its conjecture that leave voters would now vote remain, don't eat too much of that media medicine. There's a case to be made that people who voted remain may have voted leave also... We could go on and on.