Subversion wasn't a distributed VCS. Anything looking to displace git would have to make that kind of generational leap for the existing userbase to be remotely interested.
Most git user do not use the distributedness. So maybe Subversion will make a comeback similar to how people now realize that monoliths (instead of Microservices) are often better.
Distributed has disadvantages. For example, Subversion has nicely incrementing revisions like r42, where git has 8ab52fd9ee.
Being distributed is really more of a 00s concept anyway. It makes total sense that distributed systems would be replaced with more centralized ones as the internet itself goes through a similar transition.
