Still trying to work out whether these people are serious about global revolution or whether it's a hobby that gives them something to do for a weekend/evening round the university campus...
a bit tongue in cheek seeing as the dominant ideas in any society are those of the ruling class, but do you seriously believe there will NOT be a global revolution OR a breakdown of capitalist society to some kind of mad Max scenario or mutual destruction?

the history of human society is the history of social revolution, so how can you believe that capitalism will go on for ever?
I want to know what happens to all of the university types who join and then leave the far left sects.
don't know. In my personal experience of SW contact with students has played a minor part. got involved with SW around 1985. I think I was the youngest in the branch, at 25 years of age. we never had any students as in 18-21, in fact we seriously could have done with some. though some like myself did go to university later in life [me 29]. of those who have left, become inactive, most seem to be doing what they were doing when they was in the party, teachers, physiotherapists, BT worker, FE teacher, nurses, IT, unemployed, long-term sick, retired, housing workers, GP, industrial waste, town planning, etc. hope that enlightens you.