A new poll suggests a majority now think leaving the EU is a mistake. One shouldn't get too excited by one poll, but the implications of a majority of the public thinking it a bad idea to leave could change political debate significantly.
I suspect it has a lot to do with the way the government is trying to suppress knowledge of the likely impact of Brexit.
Most MPs still think that staying in the EU is best for Britain. A faction of the Tory Party has successfully used the referendum result to railroad Parliament into voting the UK out by arguing that "the will of the people is sacred." If the will of the people changes, as in any democracy it can, that argument falls away. A persistent poll lead in favour of remain, based on a better understanding of the likely consequence of having the worst of both worlds might make a pause or even a reversal of the exit process far more likely.