the younger population generally do want change and are blocked by the older generation.A couple of points. The bitter old people built the world you live in. UK plc is a ponzi scheme. You can't just add people to the bottom of the population pyramid. They get old and then you have to add more people below them and so on. Where do we draw the line 90 million 120 million? Eventually you run out of resources.
We need amateur ways to do things with a stable sustainable population. If that means we have to change the old ways of doing things so be it. That's what the younger people should be doing, not just moaning about old people and electing for the easy option of the ponzi scheme, hoping it doesn't go pop in their lifetime.
and you cant change that over night, you need a gradual change in economic modelling over many decades.
an exit is not going to do anything to change the economic policy of government away for expanding population, towards a stabilising ageing population. it will just be ignored like normal.