Let me preface this by saying I'm the biggest Nintendo fan boy you'll ever meet. I don't plan on selling my Wii U or whatever. I do need to get a New 3DS since my old one has a broken circle pad.
I think this event really sums up where Nintendo is. The Wii U is, for all intents and purposes, dead. They'll release what they have to just to keep their heads above water. They'll do what they can to maximize profits. (That's why we see so much Amiibo integration.)
The biggest takeaway is that Nintendo simply cannot support two devices on their own. I think the NX has to be a hybrid console/handheld. I think they have the resources to support one system on their own without too much trouble.
It doesn't matter what Nintendo releases hardware wise. The 3rd parties are not going to come back. It'll be three games since EA sports has supported the Nintendo home console (Madden/FIFA 14, 15, 16). It's now lacking the last two CoDs. With the exception of Just Dance 16, I don't think there was a single 3rd party game announced for Wii U this E3. These companies aren't just going to rush back until the player base is there.
I think that's why this even really showed how Nintendo is caught between a rock and a hard place. As a business, they have to salvage what they can. However, they can't afford to invest money in games that aren't going to sell at all. Then, they have to make sure they don't tick off the people who have invested in their platforms.
It's for the last reason that I think this even failed so hard. They showed what they had, but what they had is not acceptable while still marketing the device. They needed to open up some more Virtual Console stuff at least. They need something to satisfy those who have bought the system. Something. Anything, really.
They didn't do it with this conference. They just managed to tick off everyone.