The milestone that marks GNU Guix 1.0 is their package manager I believe. At its core, this system still uses Linux as its kernel, so it's not the 'pure GNU' system that I believe you're describing. As it stands, GNU Hurd is still another 30 years away from completion (sadly). The GNU project's vision has been effectively realized with the Linux kernel, which itself is protected by the GNU GPL. GNU succeeded long ago, but this is their iteration of a free system with the Linux kernel.
I don't think capitalism and RMS' principles are mutually exclusive. RedHat was a big step towards proving this. One of my favorite games is open source (ToME), and I happily bought and paid for it. I'd happily pay for an open source, freedom-respecting operating system if my support was prioritized and didn't consist of canned answers from someone's clipboard. Closed, proprietary software has greatly benefited from many free software principles, albeit by strip mining the ever living crap out of them.