Actually the core will unbundle as soon as there is a platform that can decentralize the actual social networking. The accounts, connections, authentication, subscriptions and notifications, realtime group experience (like chat) etc etc.

Right now to see what your friends have posted on fb you have to be on fb and be in their friends' list. Which leads to a snowball network effect. Imagine if you had to do the same in order to receive your friend's email from down the hall!

Right now people in an african village have to be connected to the internet using baloons or drones in order to communicate WITH EACH OTHER and share videos and photos taken on their phone. Why does their signal have to travel halfway around the world to a fb datacwnter just so they can plan what's for dinner?

This centralization is actually perverse and a SYMPTOM of the lack of standard for decentralized social networking, and open social network implementations. Diaspora was one attempt, but what else is out there?