Seriously, people should just work whatever hours they want now (or don't want), look for other jobs, until they get caught.
It's always the same with the bean counters, you can measure cost, salaries, etc, but you can't really measure happiness and motivation (well perhaps with surveys). In the end you are perhaps left with lower cost, fewer people, but these people are not motivated to to anything or do anything well.
I wanted to believe that Elon had a plan. I now believe he has not the faintest idea about how to run a software company.
And maybe that's a US problem... I see the same with construction and service workers, nobody has pride in their work left, just doing the minimum, hoping to get away with it... because their leaders are telling them that cost is all that matters.