It's a bit of a straw man when people claim we can still work in Europe. Of course, but only only for the rich/well qualified. Unlike now where anyone can pop over to Belgium etc, to apply for the Delaize graduate scheme, such opportunities will cease when we leave. Or pop over to Germany to study their MSc for the same fees as a German national (or any EU member state).
I find this analysis on the reasons people leave to be interesting - haven't read the primary article yet, but interesting all the same:
How the government’s pro-remain leaflet shaped the EU referendum | SPERI
(It's really interesting that the governments leaflet reduced the likelyhood of voting leave in the same type of people targeted by Cambridge Analytica),