Is the 3DS the REAL cause of Wii U's struggles?

[NintendoPie]

miz1q2w3e said:
The lack of Mario Kart is the REAL cause of Wii U's struggles.

Well, some people don't like Mario Kart. I don't get these citizens.

However, to most people, Mario Kart is a real system seller. Not having the games and stumbling out of the gate is what has/is hurting the Wii U. I chose "Yo Mama" in the poll as that sums up my feelings well.