Because it makes sense. Does anyone actually believe that Nintendo will show nothing new at E3 and have only Smash Bros for the Holidays? 

If we can expect a COD based off of history, we can also expect Nintendo to release more than 5 games in a year. (Based off history)

In every sales thread that mentions the Wii U, nearly everyone says "it depends on how well MK & Smash do" While they are both huge series from Nintendo they are clearly not all the Wii U will have this year.

Also, in every thread that pits the Wii U and XBO against each other, people bring up bundles and a price cut this Holiday as advantages for the XBO. How? Do people not expect bundles and /or a price cut from Nintendo?

This thread isn't trying to say the Wii U will start selling huge Wii-like #'s or anything but why do people act as if Nintendo will do nothing other than release them two games?

I dunno man, you see, looking at statments made by iwata and myamoto in the past, and the development on this gen so far, it's really hard to me to believe that they have all those unnanounced exclusive gorgeus games in the oven baking for more than 3~4 year now, harder yet is to believe taht will be in the lines of f-zero, stafox, oreven something new. The statments they had on the last investor meeting painted a different picture:

1. Myamoto believes that the problem of WiiU lacking games is solved. Hes not talking about only quantity, but quality too, based on the praise SM3DW recieved, and even managed to sell > 1mil before the year ended. This is not something new when come to nintedo. Back in the n64 times they had like 12~13 releasinga  year, while PS recieved more than 100. They actually believe that is most important to make 1~2 blow way games than 3~4 good games. See their focus is so strong on SSB and MK?
2. Myamoto also stated that they will "put resources" on QoL to develop something fun(can even be the new IP that he mentioned before), so is not like they are focusing on how can we save wiiu, and more like how can we save ourselves?
3. Iwata believed that they have to focus more on the gamepad, and pointed the revealing of games that use nfc in this e3, so i will not rule out the possibility that all new games(if its more than one, wich i doubt a litle) for wiiu will something in the lines of animal crossing with nfc toys.
4. Nintendo almost only talk about MK and SBB. Back in may, kamiya complained that he was somewhat disapointed with the lack of effort that nintendo put on promoting W101. He said that not many magazines had previews of the game, and everything that nintendo made to promote the game was actually his idea. The site was his idea and he mentioned that a lot of people with he talked tough that the game was about dogs(in japanese sounded like that). The direct? His idea. Remenber that nintendo made a TV ad of pikmin 3? W101 saw nothing of it. Some argued that X was the best game nitenndo showed at e3. The problem is, at e3 nintendo booth, there was nothing about it. They were showing 3DS, and even Planes(tie-in of the film), they even bring someone to do cosplay of bayonetta, but there was no sign of X. SBB was announced at e3 2012, altough the first footage emerged on 2013 e3. Since then, we saw the release of a screnshot everyday. We see the release of  a new pic about a new track on MK every 2 weeks. Nintnedo only mentioned X 3 times. Bayonetta 2 close to five, we are supposed to recieve those games before SSB WiiU yet we still have no idea about the story on X or more information about Bayonetta gameplay style. Remenber Yarn yoshi? Or the fire emblem crossover? And zelda musou? What nitnendo has talked about those games after the release of DK?

I actually expect the reveal of the new zelda, but i really don't believe that they will something totally not expected for WiiU(read: ceasing production/cuting price and making bundles is not unexpected)

That's not comparabel though. Nintendo has a bunch of multi million sellers but also a huge bunch of games that are barely doing a million or two. The latter won't help the WiiU unless they're produced in masses, which they aren't.

Now what's comparable to this year's annual releases (past sales in brackets):
AC Unity (10 million seller), CoD ... (20 million seller), FIFA 15 (10 million seller), Madden 14 (5 million seller)

Plus other: Batman Arkham Knight (9 million seller), Destiny (about as big as Titanfall), Watch Dogs (launches later on WiiU), Elder Scrolls Online + games with unconfirmed release dates and possible new announcements at E3

So aside from MK8 and Smash Bros. they would absolutely need other heavy hitters (Zelda, Wii Sports U, Pokemon U) to release during the holidays to even be somewhat competitive.

Yoshi's Epic Yarn, Bayonetta 2 and X won't be enough.

In every sales thread that mentions the Wii U, nearly everyone says "it depends on how well MK & Smash do" While they are both huge series from Nintendo they are clearly not all the Wii U will have this year.

Also, in every thread that pits the Wii U and XBO against each other, people bring up bundles and a price cut this Holiday as advantages for the XBO. How? Do people not expect bundles and /or a price cut from Nintendo?

This thread isn't trying to say the Wii U will start selling huge Wii-like #'s or anything but why do people act as if Nintendo will do nothing other than release them two games?

Both of these questions can be answered by looking at the past 18 months of WiiU. No games have pushed WiiU so far, that's why over 18 months which includes 2 holiday seasons they've barely hit 6 mill. Smash and MK are considered their biggest hits in terms of selling hardware.

XBOX has a target audience, that audience will react to price cuts and bundles. WiiU won't. It's that simple.

Both of these questions can be answered by looking at the past 18 months of WiiU. No games have pushed WiiU so far, that's why over 18 months which includes 2 holiday seasons they've barely hit 6 mill. Smash and MK are considered their biggest hits in terms of selling hardware.

XBOX has a target audience, that audience will react to price cuts and bundles. WiiU won't. It's that simple.