If individuals have agency over their working conditions, it might encourage such thinking to extend to other areas of life. Such urges are better characterized as seeking the anonymous safety of "being part of something," which has the added benefit of reinforcing the herd instincts at the same time.
If enough people do just that, that is a movement.
Employers are not fungible. In certain fields, there are a small number of high-prestige employers. It makes more sense to organize in support of remote work than to leave.
There's an organized effort to prop up the value of commercial real estate by ending WFH arrangements - of course there ought to be an organized counter-effort by people who value work-life balance, short commutes, their health, whatever.
Do you have a reference for this organized effort? Sounds like something that would be good to know about and publicize.
Because atomized attempts are less likely to deliver change
You're implying "movements", for some implicit definition, are bad, but you haven't explained why.