They're not, you're all just craving it, but it's not happening.
They specified that the event was going to focus on 2015/early 2016 games for both of their consoles. Dropping support means releasing 8 Wii U games (or more if the project games are released as well) in 6 months, starting with Yoshi.
3DS is also getting a few first party games as well.
Mario Maker, Yoshi, Fatal Frame, Xenoblade, Mario Tennis, Mario & Sonic, Animal Crossing, Devil's Third, and Star Fox. All 2015 games. 2016 has the Project games, Shin Megami Tensei/Fire Emblem, Zelda, and whatever games they decided NOT to announce today. Geeez, if that's dropping support, then Sony literally set Vita on fire, PS4 is being kicked in the balls with next to zero first party releases this year (not including remasters of already existing games).
Chill out, they're support for Wii U has not been dropped.







