I think you underestimate the number of people who voted Remain, but who now think we just have to get on with it. Of course there are many Leavers who will have seen they were conned and who will have changed their minds. We all understand that. But is that greater than the number of Remainers who are so sick of it, they just want it done? It's wild speculation I think to suggest that the net change is a big swing to Remain. In fact if anything, I'd suggest the opposite is true.
Of course if we got a second referendum then that would give everyone an easy way out and I am sure Brexit would be cancelled. But we are not there yet, and from where I am sitting right now, I think there's more people who want to get on with Brexit than not. Remember the HoC is hugely pro-Remain and yet even the passed the motion to take the WA bill to second reading. And they've never found a majority for revocation or Ref2. Surely if they felt the country had changed its mind, that would be an easy decision?