I think this is a good concept but it will definitly be bug prone which is the reason it is coming out in 2015. I would prefer to have a better version of it later than a bad version next year. I do have to say i am a bit skeptical. I do think it would be fun however i am not a huge fan of moving around and working up a sweat while playing video games, i go outside to do that. I have to say it seems way more cool that you can do that stuff, just think u could control any electronic from anywhere, you could hit the snooze button on your alarm clock from across the room, or channel surf with you hand, no more looking thru the couch for the remote.
I think it could be fun for a while but it does bring up some questions about controlls, do i have to walk in place to move and what about turning around, if i want to about face to see a target could i still see the screen, changing weapons also seems hard, but i do think it would be very fun to see a grenade on the ground, scoop it up then toss it, or dive out of the way of a truck. Sleath games would also be amazing with this concept,
so i am glad that microsoft is taking their time with this and perfecting it, and i dont think that it will put nintendo out of business (maybe sony) because nintendo has a different target market than microsoft. Nintendo games tend to focus on younger kids (dont attack me because of this, i know there are games that everyone loves, i personally couldnt live without mario cart, or super smash bros) but i do think that microsoft will gain a large market share because of this.