I think the point is more that there's increasingly no reason for CircleCI to exist. All your major code hosting players have a CI tool and the various accessories you'd want to attach to it.

I think CircleCI has a niche in orgs that self-host code in e.g. phabricator or gerrit, and want a cadillac CI experience without building it themselves in jenkins or similar. I'd argue that niche is shrinking, and as a CCI employee or potential job-seeker I would wonder whether CircleCI is a good place to be because of that.