Isn't modern system administration very much still a thing, just with a different name: devops? I worked with a really bright (sysadmin/devops) guy that built out a FOSS configuration management service using saltstack and zabbix; a near real-time visualized platform of critical assets that also afforded a great deal of control, all from a distance.

I do very much agree that use of command line is declining, though; in general, technology - both its physical form and digital interfaces - has become more closed to the user. Really hope that changes.