We are still going to get new games from those franchises and there's no need to keep remaking "the same game" every generation. Smash Bros 4 is very recent, also. We can live with re-releases of these three titles to help expand the NS library.
I would understand people being mad at Kid Icarus Uprising, Captain Toad or Metroid Other M enhanced ports. But I like how they are just going to update these three titles, to make studios free to try new ideas. Maybe I don't this is a bad idea since I didn't buy a WiiU and I also skipped Smash Bros. 4 on 3DS.
I agree with this even if I have a WiiU.
The way I see it Splatoon came to be because of freeing a bit of the Animal Crossing team, and we could have got simply New Leaf HD instead, pretty much like what City Folk was.
Sakurai managed to make Kid Icarus Uprising between one Smash game and the next one, and who knows what could the Mario Kart team do if given some chances. They've been making only MK and Nintendogs for the last 10 years.
The real question for me to double-dip would be how much new content could these games have.
All DLC + 2 or 3 new fighters for Smash, another extra campaign for Splatoon besides the customization, etc.