I think the milestone of Linux on the desktop is pretty much irrelevant these days for most people in the home. If you have a desk job, it might have some relevance, but I imagine that most people don't care too much about what they have to use as long as someone else maintains it.

It becomes more relevant if you have to work somewhere with a bring your own device policy, especially if you don't get the choice of OS yet you still have to keep it running.

I would guess that Linux passed the milestone of being the dominant consumer OS when Android got popular. Not that it did much good for user freedom.