I think it's a bad call. To me, these input devices create a lot of confusion for very little benefit. I think it's a sign Apple has given up on the philosophy of trying to make everything accessible to the average user.
They have gone over to Microsoft's philosophy, which was that UIs should be like an iceberg, with a deep well of hidden functionality for advanced users to discover, and then a separate "normal people" UI layered on top of that.
I think there's a MASSIVE opportunity right now for someone to build a new OS, designed around a very limited set of inputs, and a highly constrained widget library. With an emphasis on speed, putting as little as possible on the screen, and like Apple of old, having simple apps that let people do things pros typically do.
For example, you could design a UI that would allow you to easily cut together clips from multiple videos. This was hard, and then iMovie made it easy, but now it is hard again. Those kinds of features make good ads, and lead to good word of mouth.
Basically, take Steve Jobs' original strategy with the iMac/iPhone and do it over again. Apple has totally departed that path.