> The article hypothesizes that analytics services will probably move their tracking code from client-side JavaScript to the server-side,
From talking to several companies that specialize in this (via a friend privately, and by interviewing at some) that is already happening. Basically using all tricks you heard from https://panopticlick.eff.org/ are used, fonts, canvas, webgl fingerprints -- everything.
That would be more related to device fingerprinting rather than just server-side analytics. You would still need client-side javascript to accomplish most of that, but yes it's also on the rise due to the (in my view somewhat unfair) collapse of the 3rd party browser cookie.
From talking to several companies that specialize in this (via a friend privately, and by interviewing at some) that is already happening. Basically using all tricks you heard from https://panopticlick.eff.org/ are used, fonts, canvas, webgl fingerprints -- everything.