All the fruits are going to small number of people in the top. You say mostly useless degrees… what about all the mostly useless things - the lamborghinis? the never ending houses? the gimmicks, gadgets, iphones every 6 months…
Why do we supply that and dont supply basic living conditions to everyone?
Why? Because the medium of exchange function stops the moment economic growth stops growing at the rate of productivity. This is because the richest individuals are hoarding employment opportunities and get to save money against the will of the rest of the population. If one guy is doing the work of two, then one person has nothing to do. We grow the economy two fold, so there is enough to do for everyone, even though there are enough products and services for everyone. It's that stupid.
How, exactly, are we going to supply all of that to the firehose of people graduating with mostly-useless degrees and job skills?