Miiverse is a system feature. And Fullblox running pretty badly in 3DS is an indication that their standards aren't as high as you may praise them. Welcome to reality!
Fullblox doesn't run badly on a standard 3DS. You're clutching at straws.
Miiverse is also the most minor 3DS feature. It's not a core feature like BLOODY SLEEP MODE.
So they're moving on to super game boy and virtual boy now?
No. They shifted their Virtual Console focus to the Wii U since the NX is to absorb Wii U architecture so they can just shift the games over straightout.