We'll see how Intel's ideas pan out. For text entry, I just don't see a viable alternative to a keyboard...yet. WHEN someone thinks up a better way, it'll catch on like wildfire. Until then, the entire business space is going to want a keyboard of some sort (touchscreen or the real thing). As for gaming and such, I think that this opens up some neat possibilities. The "hardcore" gamer crowd and RTS folks won't go for it, but casual gamers and maybe even fans of stuff like Skyrim could have a lot of fun though.
I'm not sure where the additive vs reductive forming process argument came from. Trying to argue that 3D printers are a useless gimmick is asinine though. I happen to HAVE a 3-axis mill, 36" lathe, various welders, etc in my garage and I can assure you that while they are still extremely useful, a 3D printer opens up new possibilities that are just not practical (or realizable) with traditional reductive processes like milling. I think that they are all complimentary in the end. 3D printing has simplified mold making for my DIY aluminum casting setup BIG TIME. Model the thing, scale it up by +3-6%, print, make a sand mold. I don't own a 3D printer, so I farm the jobs out to fab houses since I cannot yet justify the cost of the equipment currently available, mainly since it is all FDM type stuff which makes relatively weak parts (I am waiting for the patent on the SLS process to expire next year at which point there should be all sorts of more DIY-accessible stuff coming about). 3D prints also allow me to prototype stuff quickly and cheaply; stuff that I build on the lathe or mill, but that would cost too much time and material to try to iterate in metal.