I used to think that way, but have latterly come to the conclusion that leaving the EU would in fact make very little difference to the way we are governed. In or out of the EU, I see our political élites behaving in exactly the same way.
Exit from the EU is a precondition to fixing the problems not the be all and end all. You must start with the first step etc. etc.
A UK exit from the EU would set off seismic waves that would topple all sorts of edifices. Because all of the organizational / societal fault lines are not known or understood the results would be totally unpredictable. It is unlikely that the élites could continue to behave in the same way. Even if they tried it is unlikely that all of the other players would which would disrupt the élites agendas.
Get out, tear down the house, then get to work building something better. This is not a case for short attention spans. When the power vacuum is formed work to get the right stuff in.
You can take that view ... but the post-exit conditions will depend on the circumstances and manner of our leaving. There is a range of possibilities, from the exit sparking a renaissance in British government, to not very much difference at all, to inestimably worse. However, when you tear things down, very often the result is worse than what you started with.
I think you would be very brave if you asserted that you knew what would happen.