Just about. They already showed off social functions comparable to what Microsoft and Sony showed off today. Their little tease of a new Mario game was better than 90% of the stuff anyone else showed off today. Then Ubisoft comes out and names 8 titles in development for Wii U, some of them exclusive. EA didn't mention Wii U, but they still listed it at the end as one of their platforms, so I assume Madden, UFC, FIFA, NFS, etc. at the very least are going to be on it. Basically, Nintendo only has to show one excellent-looking new game tomorrow to seal the deal -- and we already know they're going to have Pikmin 3.
Although I will say this: new exclusives are nice, but they aren't substitutes for big multiplatform games. ZombiU looks okay, I guess, but compare it to Dead Space 3. Rayman Legends will be great, but they need Watch Dogs, too. Even Far Cry 3, Medal of Honor, Splinter Cell. Just name them, Nintendo. Tell us they'll be there. As it stands, sure, Microsoft's conference wasn't particularly impressive... but it was followed by two conferences showing off more games coming to XBox. Nintendo needs that effect: "Here are new Nintendo games coming to Wii U -- and by the way, most of the games you saw yesterday will be on Wii U, as well."