Wow, is it just me or is there a whole lot of passive aggressiveness in this post?
Anyway, to address the post, yes we do know that Google have implemented most of OAuth 2.0, but in reality not everyone is happy to use Google of various reasons.
There are plenty of people and organizations have to implement OAuth 2.0 server-side and wade through messy specification where half of it may be irrelevant.
But considering WebRTC could potentially ruin much of Skype's business, a cynical guess would be that they won't make this easy.