I totally agree that onename.io has done a good job integrating that site with Namecoin. However, with this new project ONS, I don't yet see a way to certify all the social identities that Keybase supports, not to mention the attractive user interface and convenient command line client of Keybase.
That said, it's a new project. I'm not saying onename.io won't accomplish this (I hope they do!). I'm just saying they have a lot to do to match what Keybase has.
Care to explain how? They're the team behind onename.io and clearly seem to have just as strong an implementation.