Seeing federated platforms really makes me wish gaming platforms like Steam, Xbox, and Origin federated, for cross compatible friends lists, game invites, multiplayer, etc. Think there's a chance?

I wouldn't hold your breath for that. They want players to attract their friends to their platforms. If we could play / talk to each other, there would be no reason for us to buy the games for their platform. I would really like it, but it's less profit for them.