Thankfully most people have learned from the absolute shambles of Brexit and either of these countries leaving is extremely unlikely.
Surveys here have been showing a trend towards greater public support for the EU. Its advocates have been pushing for closer integration and even talking of a referendum on rejoining. Although of course this also has to be viewed cautiously because the polls before the Brexit referendum had also pointed towards remaining and one of the biggest fans of the EU recently has been that unpopular PM who might not be in office for much longer.
People in the UK, like the US, seem addicted to voting for morons then being surprised when they do the things morons do.