No way would it be $299, a Kinectless model would be at least $399.
OG Kinect cost $150 stand alone, Kinect 2.0 is pretty much a better version of that in every way id see it adding $200 to the box.
A verified Xbox One Dev (on Reddit, so take it as you will) said Kinect 2 cost as much to make as the console.
I've got this shit Pre Ordered so not some person shitting on Xbox ONE.
Short answer no, I would not go as fair as saying never but right now Microsoft is playing up that kinect is apart of the design of the system and it used in a lot of features in the UI. So i don't think they would have a kinect-less model anytime soon. They may have a cheaper one with a contract to gold for a few years. But until kinect goes completely downhill for them they will have a kinect in a box.