It is clearly their plan to do this, and in line with their stated intent to form the "identity layer" for the web. It's unlikely to work though, because the web has a great tendency to upset the plans of those who want to basically control the whole thing. It's sure that some kind of identity layer will come into use, but an open system (maybe a descendant of OpenID, maybe not) will always have the advantage of allowing myriad people and (importantly) companies to do different things with it. And that's the kind of evolutionary openness that saw off AOL in the 90's in favour of the web.