1 reason:
The games!
All I need are 2 games: F-Zero and Super Smash Bros.
F-Zero was a great, fun, challenging series that Nintendo has seemingly forgot. I always loved racing on a futuristic road, going over 1000km, with a pumping electronic soundtrack. It gives me a great feeling.
As for Super Smash Bros 4, Brawl was a masterpiece! All it needs are more characters, specifically more 3rd party, particularly from Sega, Namco, Capcom, and Konami. Add these characters to the roster and I will bounce off the walls!
Klonoa -- representing Namco
Simon Belmont or Bill Rizer -- representing Konami
Ryu or Zero -- representing Capcom
NiGHTS or Shadow the Hedgehog -- representing Sega
and keep all the original characters, and consider Nintendo has a deal with me!