There is a wider point that high inequality in a society is generally very bad news. It's one of the main points in Thomas Piketty's "capital in the 21st century" book. Even if you're at the very top you still have the risks from higher crime etc. (you can pay for private security but then have reduced freedoms, may live in fear etc.).
I think a good proportion of the Brexit voters were protest voters, and, somewhat understandably, if you feel you're in a bad situation, have hit rock bottom, you will vote against the government and vote for change, any change, as you feel like it can't get worse. Though actually it can.
And while we still have no real idea what the Brexit will end up meaning, it will as a minimum cost a load of money and political energy to sort out, that therefore won't be available to work on existing unresolved issues such as unemployment, the hangover from the financial crisis, growing inequality and the lack of financial literacy of millions of people.
Short term all the 'hard Brexit' stuff is intellectually offensive, and as somebody with an EU national partner it's also somewhat of a concern that an assumed future of living freely in the UK or EU could be restricted (I don't imagine that even after a Brexit an educated Brit won't be able to apply to live in e.g. Germany and vice versa, but having to apply, meet criteria etc. when currently you can effectively just turn up is obviously a level more complicated and introduces the chance, for some bureaucratic reason or otherwise, that your application will be delayed or refused).
Still a long long way to go on all this Brexit stuff, so I refuse to be too pessimistic about doom & gloom possibilities that may never get close to happening.
I can't see a longer term future of "raiding" savings (politicians all earn 3x median wage so won't vote against themselves), but a future of higher income taxes and reduced tax relief for those better off could come as part of anti-inequality and/or government debt reduction measures (which if done correctly I may be in favour of).