Historians may never agree as to the causes of the referendum result, but as a contemporary observer, I attribute it to these facts:
1) An insipient hostility to, and suspicion of, our European neighbours which transcends socio/economic divides and has, for many many decades, been reflected in and encouraged by sections of the media, which never balked at disseminating falsehoods and outright lies - two specialties of Boris Johnson during his career in journalism, and which he continued when he led the Brexit campaign, tinged as it was by xenophilia and a loathing of all things "Brussels" .
2) A blaming of the EU for the hardships and disappointments which resulted directly from the government's austerity measures introduced after the 2008 financial crisis.
3) A sense, among some Brexit supporters that Great Britain was diminished by its EU membership, was under the thumb of unelected EU bureaucrats and that freeing ourselves from them would restore a (delusional) "sovereignty".
I think the slide towards declining influence/shrinking status and diminishing prosperity will be fairly imperceptible, apart from the occasional jolt which will send out short-lived and soon-forgotten shockwaves.
The reason for all of those three reasons is simple: The tabloid media and it's tiny number of wealthy owners.
The Daily Mail destroyed the United Kingdom, and is proud of it.
If only it were that simple!
No-one is forced to buy the Mail; people do because they like it, and one of the reasons many of those people like it is because it chimes in with their own opinions.
In common with all our national papers, it doesn't
form opinions so much as
reflect them.
Politicians are undoubtedly influenced by the most popular sections of the press (which happen to be owned by people such as Murdoch and Harmsworth who use them to project their right-wing views) but there are occasions when our political leaders have shown resilience. For instance, in the period leading up World War 2, the Mail was pro-appeasement and anti-the "war monger" Churchill, an embarrassment which it hopes no-one now remembers...