I don’t think you need 51% to affect things at the margins. At one company, we were early to the “remote is OK” and “remote is good” camps. It helped a lot with recruiting and retention, and let us hire a better talent pool. Post-COVID with everyone offering remote the benefit has dwindled for companies early to accept remote work. I think someone offering 4 day work weeks would be able to hire talent they wouldn’t normally be able to. If the promise of “same productivity, less hours, same pay” is true, then they’ll outperform and out recruit.

Mass strikes are certainly quicker though.