The EU wont exist in 25 years time.
Without the money from the UK the countries that benefit from being in the EU (those that currently take out far more then they pay in) will not get as much money and wonder if all the hassle is worth it (plus seeing all their best people go to other EU countries for work).
And without the UK money the German people will soon get fed up with having to bail out Greece, Portugal, Spain, Ireland etc every few years on their own.
Plus if the Romanian criminals (and other EU criminals) cant come here they will start to go to other EU countries, and those countries will soon get fed up with that.
Plus people will start to look at how much these MEPs get as a pension (Farage will get about £73,000 a year pension) which WE, the EU members, are paying for, and realise the whole thing is a massive gravy train for European bureaucrats (many who are unelected).
The EU is going to implode soon, we are just the first to leave.