I can't imagine it will ever become mainstream to store source code using anything but plain text unless we stop using Git and representing files and directorie

I can't imagine it will ever become mainstream to store source code using anything but plain text unless we stop using Git and representing files and directories in the classical Unix fashion. The alternative to plain text is programming-language specific version control and source code formats, and managing codebases using some external database tool, or something similar. It also means you can't easily interoperate with existing plain text code. I predict the only way people will switch is if there's some overwhelming competitive advantage in storing code as something other than text files, to the point where business competitors will go bankrupt from not upgrading technologies. And then the open source community will adopt it after the industry does.