The DevOps movement petered out because it solved most of it's technical problems with tools that have become industry standards.

As a sysadmin, you used to have to write scripts to solve EVERYTHING. Especially since tooling for ops people in the 2000s was a load of hot garbage. A lot of tools back then had GUIs, which weren't automation friendly.

Nowadays most ops problems have some easily automatable tool, which I think gives less incentive for sysadmins to reach for a programming language.