The coin survived the fall of proofofbrain.io. I think that was the big test.
I've been using vybrainium.com and peakd.com.
Personally, I wish that the second layer sites used subdomains of a common domain; this way we would not be held hostage to a single domain registration.
That does make a lot of sense. It's the way blogging giant "Blogger" works. You can connect your own domain very easily, but when that domain fails, the site automatically reverts to "yourname.blogpost.com," so nothing is actually lost.
Of course, this brings up a number of people's obsession with everything being "decentralized."
But decentralization isn't really proving itself terribly stable...