[Feneric]

I think his point is that our society is putting too much value in entertainment sorts of goods like art, sports, literature, etc. and not enough in things like infrastructure maintenance, science, teaching, etc. He's not saying we don't need any entertainment, just that we don't need anywhere near as much.

Recall the Golgafrinchans. His argument is that our society is pushing more people out of the "thinkers" and "doers" category into the "useless" category, and that if they had our population breakdown they'd need to shove a lot of entertainment producers on Ark B.

There's some truth to it but also some falsehood. I think the reality is a bit nuanced.