Do you know the difference?  I didn't say I disagree.

You didnt say the exact words "i disagree" but you said you cant say you agree. Or in other words._ you disagree 

It doesn't matter if you agree or not, the sales show that Mario Kart is a bigger seller than Zelda! Accept that and move on!

I don't have to accept nothing.  Mario Kart is a bigger seller then Zelda, but stay on topic.  Is Mario Kart really the Wii U last hope? 

You're right, you can just live in denial!

And idk what you're talking about but I've been on topic! The reason the OP is saying the Wii U rides on Mario Kart 8 is because MK8 will most likely be the single biggest thing saleswise that comes to the system. Yes, bigger than Smash Bros, bigger than Animal Crossing, bigger than Metroid, and certainly bigger than Zelda. If Mario Kart 8 can't change the Wii U's trajectory, it's not likely anything else can.

I quess Nintendo should of made a Wii U Sports then.

They did, it's called Wii Sports Club!

Then they need to come with something at E3.  I betting on Zelda U, not Mario Kart 8.  Although Mario Kart will move hardware.

Here are some interesting facts:

Wii U (according to VGC) sold about 3.1 million from end of March 2013 to end of March 2014.
Nintendo are predicting sales of 3.6 million from 1 April to 31 March 2015, and that's with MK8 and SSB.

  This doesn't suggest that they're expecting these two games to make an enormous impact generally, (i.e., they're not expecting MK8 to shift millions of consoles)

Looking back at the previous games in the series

For an install base of 33 million, MK64 sold 10 million
For an install base of 22 million, MKDD sold 7 million
For an install base of 100 million, MK Wii sold 34 million

In all three cases, roughly one third of console owners bought Mario Kart, and that Mario Kart was introduced to a lot of casual gamers through the Wii.

It's interesting to note, however, that of all the Wii games, MK Wii is the only Wii game to have exceeded 1 million for the year ended March 2014. 1.27 million to be exact, (source - Nintendo supplementary information doc) which almost matches up with VGC sales of 1.25 million Wiis for the same period. Okay, so that might mean that there are a lot of MKWii bundles still out there, but it doesn't change the fact that for just about every Wii that was sold in the last 12 months, a copy of MKWii was sold too.

What does this tell us? Not much, beyond that MK8 will probably sell roughly between 3 and 3.5 million copies by this time next year (one third of an install base of about 10 million based on Nintendo's hardware predictions.), that Mario Kart is a highly popular game and that it will be the MK8 hardware bundle that entices the casual gamer into buying the Wii U in the end. By how much is anybody's guess, but judging by their prediction, Nintendo don't appear to be putting all their hopes on it.

By this time next year?  It will sell 3.5 million way before then.