There may be interesting organizational hurdles, as subjectively the community, or at least the mod community, or the users of the most popular mods, appear to implement changes showing they believe the best way to enhance the multiplayer experience is new sets of blocks doing cool new things with new varieties of technology, whereas most of the listed "upgrades" boil down to making a nice chat system. Make the game more fun with more toys, vs lets make an app to socialize oh and there's also a game attached or something.

I think this frictional point is where most of the interesting action will happen in the near term evolution of MC and Mojang.