Indeed and the demographic was that many more leavers were retired and remainers only just old enough to vote. So its inevitable that the vote will swing back to re-join unless leaving is shown to be a fantastic success.
Democracy is fluid not static.
At the moment its still fresh in peoples minds before long it will slip and something else will take its place, most will just go back to getting on with their lives in the stark reality that life is too damn short to go on whinging about something, it will just become the norm that the UK is not in the EU. For me it all ready has but then I'm a realist and not a fantasist.