Being closed off also ment less random garbage and trolling, and made it feel more like a together community (plus buildt in drawing tools encouraged art creation). And once again without it there's a lack of integration like seeing random posts on billboards in Splatoon or messages in a bottle in Wind Waker, that really takes away from that feeling of a console world with many people in it. And they sure as hell aint gonna let Twitter posts show up, since they have no moderation over that, they might make something for that specific game like Splat 2 but then you lose the connection between games and abbility to just browse everything to your discretion.Any social network makes it, and have a circle of people so much bigger than miiverse.
And this is.integrated to the people.who own a Nintendo system. Which create a bunch of people who have the same ideia, almost the same experiences. Share to people who doesnt know how the game works, how wonderful can be to.encourage to buy the system and the games.
Locked groups is doomed to be stagnant forever, and Nintendo looks like is learning from their own problems.
I mean the problem was that WiiU didnt sell well, if it did the community would grow naturally and with new people joining in there would be little chance of stagnation. Social Media is more than just a marketing tool, Miiverse wasnt here to sell you on the system, its to make you more comfortable in an already existing community.