You look at historical trends, not a single point in time.

It's not historically Myspace was the social network, it's historically social networks are displaced by others, of which Facebook is only the latest incarnation. And the future of Facebook is Myspace, ideally sooner rather than later, but eventually one way or another.

If every time something has happened before it has had the same result, trying it again and expecting something else is not a plan that inspires confidence.