I think you're missing the possibility (and unfortunately, I would say the inevitability) of backsliding. I don't think we need anything adapting as near as much as we need people to "hold the line" or "stop loss."

For me, the perfect concrete case of this was here reading about youtube-dl being removed for Github. It became clear to me that a not-insignificant number of professionals in this space absolutely equated "deleted from Github" as "literally gone forever such that no one could have it again."

People will forget about the idea of free software and taking a copy of the code home with you as an important idea to be preserved, unless the FSF et al remain.