One small thing: the Xbone is outselling the Wii U at this point by a pretty good margin. I mean, vgchartz isn't the greatest source, but their tracking generally isn't off by a substantial amount, so you can pretty much guarantee that the Xbone has at least 1 million units sold over the Wii U. Really, you can pretty much guarantee that no matter what comes out on the Wii U, it will come in last this generation. It's pretty unlikely that it will experience a sudden and lasting popularity spike at any point in its life that will push it past where ever the Xbone is in sales whenever that theoretical point could come.
And yeah, in time, Nintendo could be hurt doing nothing but making dedicated game consoles, especially when their biggest income is from their dedicated gaming handheld that is quickly being phased out by ever more capable phones and tablets. This is probably why they're pushing themselves into making quality of life products though. They know they need to push their business somewhere else if they really want to succeed, especially since 3DS sales will continue to decrease as the system gets older, with Wii U sales showing no sign of increasing in a substantial enough way anytime soon.
When it comes to Sony, as a company, they're stretched a bit thin, but their gaming division is doing really well at this point. As well, they're pushing their Xperia line more and giving more integrated functionality with their game console and other services, unfortunately kind of pushing past the Vita, but ultimately they're almost future proofing since smart phones (and tablets) are the gaming handhelds of the future. They'll continue to just kind of chug along for a little while yet, I'm sure, but eventually they will find a way to recover.
For Microsoft, gaming is kind of a side hobby of theirs. They're so big without it that it doesn't particularly matter if their game console doesn't sell amazingly as long as it turns a profit.
