I do not think Nintendo's traditional first-party titles alone (and minimal third-party support) are enough.
I'm not sure Nintendo are going to have the same problems they did with third parties that they did on the Wii or the GC.
And, just to be clear, because you and Steve Youngblood aren't very good with non-binary posting stances, that doesn't mean I don't think they won't have any problems with third parties.
Japanese support (what's left of it after the massacre to Japenese development this gen) I think is going to be far stronger than they have historically enjoyed since the SNES era. Japanese development is looking pretty dire right now (and has been much of this generation with the possible exception of Capcom) and I don't think they can be as choosy about what platforms to release titles on as they once were; I think it's clear that Iwata has built a lot of bridges here, particularly with letting other developers use Nintendo IPs for mutual success (relative success anyway; Sega are still the only big winner playing in the Nintendo sandbox so far).
Western support isn't completely awful either, like it was on the GC and Wii.
Ubisoft must be pretty pleased with Nintendo, as they've made some decent money from them, and with the WiiU using what seems to be a relatively easy to port to architecture, I think they'll continue multiformatting.
EA have sand in their vaginas about something, which could hurt Nintendo, or they could realise that the realities of modern publishing (they're still posting losses) means they're leaving money on the table.
Activision do realise the realities of modern publishing, and will continue releasing every title they can on every format they can.
Nintendos partnership with Unity can only pay off dividends in the long run for small and midsized games, particularly titles that would traditionally go the XBLA / PSN route.
I'd be surprised if there aren't 'surprise' WiiU port announcements for upcoming titles, certainly from Ubi and Activision, via nintendo directs throughout this year.
Bit too late for THQ backing though.
If those don't happen, then it's much more serious for Nintendo.
The biggest question is if this support will continue on into the 720 and PS4 release schedules; if titles for those consoles are CPU or RAM constrained, then WiiU support will likely be poor with 'spin off' franchise versions (as we see now with the Vita).
If they are GPU constrained, graphically compromised ports to the WiiU might still be on the cards (eg 720p 'low detail' mode with fewer post processing effects or cheaper AA techniques).