Why would that happen when they can have mandatory 50 hour work weeks?

Mass unemployment with some people working 50+ hours a week will have to lead to something changing. Capped work hours? UBI?

People keep thinking the Jetsons is going to happen.

Soylent Green is a lot closer to the reality of capitalism.

You are living in a fantasy land if you think any technology (besides maybe a replicator) will lead to less work. If that were the case we'd all be on a 10 hour work week already.