You wanna know the worst thing about this conference being lackluster? People might say E3 2008 is arguably still the worst nintendo conference, but atleast the Wii was hitting it big time. To have this happen with the Wii U just when it was hitting a good stride in the general eyes of the populace is probably the worst-case scenario that could've happened today. The Wii U was never gonna suddenly sell gangbusters towards the rest of this year and the next, but at least a good press conference would've kept it's good striding position.
But now? It's gone. Both it and probably the 3DS. I fully expect whatever the NX may be to come Holiday 2016 now. Nintendo has left very bad taste in a lot of people's mouths from what they showed today and HOW they showed it (with a few exceptions). This has put them in a position where their going to have take very serious and drastic measures to have people gain interest in them back again in what ever they have planned for their future, because if not, they are going to fall even harder than ever before, and that's going to leave the NX as perpetual dead weight.
I know that quite the pessimistic outlook on things currently, but Nintendo could really, REALLY not have afford mess up at this E3, especially considering how great last year's was.