Okay, so they've tried some animated series of Nintendo franchises before, but they didn't turn out so well.
But who's saying that they can't do it much better a second time?
If there's to be another Mario animated series, then it has to be exactly like the intro sequences to Mario Golf Toadstool Tour and Mario Power Tennis (CGI and all). Both of which were more entertaining than the games themselves. If these don't just scream "Mario animated series", then I don't know what does.
If there's to be something animated with Zelda, I'd wager it would be a full length feature anime movie of Ocarina of Time.
Or maybe one with the Wind Waker style.
Something like this.And those plans by Yamauchi were scrapped a long time ago. That's not going to happen, don't count on it.