I have no reason to believe miiverse is going anywhere. Nintendo has invested to much time and effort into making it work, and people who actually use it, love it. It just needs to work faster (instant).
on a side note, I'm not a fan of the updated look, i like they way it was at launch.
https://www.youtube.com/channel/UCbchUmHiEvZ1m3b9HgW5syg
VIDEO GAME MUSIC MASHUPS