I disagree.

Nintendo always has unannounced stuff, usually at least a few that are set for release within about half a year of the time that they finally announce it. The fact that Nintendo delay Zelda in such a relatively off-hand way (notice that they didn't actually apologise, as they normally would when having to announce things like this?) suggests that they have some things up their sleeves.

I'm betting that we'll be getting an April Nintendo Direct that reveals a big title for release by the end of the year (plus a couple of small ones). They'll have released this information now in order to make sure the ND has clear air rather than having to reveal the Zelda delay in amongst it all, and thus somewhat souring the ND's announcements.

I'm also betting that they fill the gap with something more, remake-wise. Recall that Wind Waker HD came about due to Nintendo's experimentation with engines and styles towards Zelda U? Perhaps something more came of that - they wouldn't want to release another Zelda remake too close to Zelda U, or to Hyrule Warriors, but with the Zelda U delay, 2015 would be the perfect time to release another Zelda HD remake. But then, it might not be Zelda - it could be a Mario remake, for instance.

Note that the expectation of more games to announce isn't based solely on this news - Iwata said as much last month.

Another possibility is that they've already lined up the support of one or two third parties with exclusives for release in 2015. There's been a lot of speculation about the next Dragon Quest being on Wii U, on the basis of this, which comes just a week after this. There's also this, which is likely to be announced soon. There have also been other rumblings recently that suggest that there's more coming. Talk has started up again about the fact that a prototype of GTA V was up and running on Wii U a couple of years ago. Crytek has also been in the news in connection with a "huge new licensing deal" that they'll announce "soon" ("new licensing deal" doesn't sound like a normal relationship with existing partners).

And then there's things like Pokken, which has been in a "it will eventually come to Wii U" state since initial announcement... given that it's almost certainly being developed semi-simultaneously for both Wii U and arcade, it's likely that they'll be able to announce the Wii U version for this year if they need to fill a gap. In fact, its "TBA" status is probably because they wanted freedom to use it to fill a gap.

In short, the conclusion that it'll be a "grim year" for Wii U is unfounded, based mostly on a lack of experience with Nintendo's MO (this sort of thing happens when a person is used to the way Sony and MS operate - Nintendo does things differently, even on the announcements front).

I was talking sales wise, but even game wise, hell its gonna be a grim year. Pokken wont appeal to the majority, GTAV is obviously not coming to wii u, crytek partnering with nintendo would be an absolute miracle, of which rarely happens, Dragon quest just had a game released so it will be a while before the next is announced and they seem to be edging towards playstation, almost all third party publishers have abandoned wii u (even ubisoft said watchdogs is there last Mature-rated wii u game)

The only hope is Splatoon and Star fox. Star fox isnt really that popular any more so wont cause much a stir, Splatoon if marketed correctly could be picked up by quite a few, but nintendo often fail with marketing new IP's so we must see.

Splatoon, Yoshi, Star Fox, Devil's Third, Xenoblade X, Mario Maker for the last 6-7 months of the year ... looks OK to me. 

Pretty standard Nintendo year all around. Probably above average actually. 

Wii U is going to be a sales dud no matter what, it's going to be Nintendo's worst selling console and Nintendo knows that. So like it's not like there's some "OMG! Save the Wii U!" pressure on Nintendo. If Smash and Mario Kart didn't do it, nothing will. 

6 games doesnt impress at all, especially to a casual consumer, of which there is probably more than the core wii u crowd. Mario maker wont appeal to a lot of people. Star fox doesnt appeal to a lot of people. xenoblade isn't really a western-targeted game. The only thing that would attract the casual is Yoshi and splatoon. Yoshi probably will sell ok for a nintendo game, splatoon heavily relies on marketing. 

If I still had my wii u, splatoon is the only game i'd get from that list.