If enough people fight for the recognition of their need and desire to work from home, enough to enshrine it in some legal norms or at least in widely accepted and expected practices in the industry, WFH may become a right. This is how 40-hour work weeks became a right, or collective bargaining became a right, etc.
It became a standard in the US, but is not a right. And while the idea of the 40-hour work week did, indeed, come from labour groups, it was the Great Depression needing effort to try and compel businesses to hire more workers, not the fight of workers, that pushed to see it become a standard.
It wasn't a sudden bout of benevolnce from the FDR administration, or from anyone in the management or government.
Was there something to suggest it was? Getting workers back working isn't for the benefit of workers.