For me, personally, Kinect is a huge reason that I'm replacing my YLODed PS3 with an XB1.
I'm a huge fan of Naughty Dog's games, and thus I feel like I'm losing something substantial by leaving the Sony ecosystem.
That said, one look at the tech demos for Kinect 2 and I was sold. I think that the Kinect 2 will be the "iPhone moment" for motion & voice control on consoles. As a father of two young children, I love the idea that I'll be able to turn on the TV and navigate without having to look for the remote control. And since it is part of every single system, I'm confident that it will be fully integrated into every major app.
You know what sucks about Netflix, Hulu and Amazon? Searching for and navigating to the content that I want. To be able to tell the Xbox "open Netflix" and the "search Walking Dead" and immediately finding the show I want is awesome. Not having to ever fumble around with a controller + onscreen keyboard is a real game changer.
Also, while I'm leery of motion control elements in traditional games, I'm very excited at the prospect of fitness apps that can give you meaningful feedback on your form, and a circuit training app that uses your heart tate to determine the correct period of rest between sets. What about a boxing game that could accurately differentiate between jabs, hooks and uppercuts with low latency and the ability to determine speed/power? Awesome!
Microsoft has invested a ton of resources into this tech, and I'm confident that they're going to make great use of it. Unless you're approaching the next Gen of consoles with a singular and narrow focus on traditional gaming (and I think that's a totally valid approach), I think you'd be a fool not to put yourself in a position to take advantage of this tech.