To address some things:
Games: Kinect has been out for a little over 2 months people. Expecting it to have a fully fleshed out lineup of games is pretty foolish given there hasn't even been 6 months to release titles for it. Sure if Christmas comes and there are no new awesome games coming out in the intervening 12 months then absolutely go and attack the games lineup. However the current games lineup which is offered has to be considered sufficient given the fact that the device is selling above expectation.
Core/bridge titles: Since it is hard enough for people to agree on what it actually means, how can people agree that a system has them or not? For the first few months the bridge title we can all agree on is novelty. The core love it as much as the less enthusiastic game player. Beyond this there are bridge experiences like the console auto logging in the user in focus which makes the device easier to use for people who aren't so skilled. There are also experiences like drop in and out multiplayer which is great for people who only play games for 5-20minutes at a stretch. Finally there are universal services like music / netflix / Hulu *2011* / ESPN / Zune passes which are as important to the console as many huge individual titles.
Sales: Kinect is pretty much selling as fast as it could sell. I don't really see it being able to have sold another 2M for instance over and above its current sales rate. At the present point they are more than satisfactory. I don't see any good reason why the sales will suddenly die once the new year starts, its not like people suddenly realised that the Wii would be 'destined to be a dust collector' on Jan 1 2007 and then told all their friends not to bother. If we go by Nintendo then word of mouth ought to peak closer to 8-10 weeks out from release or maybe much later given the lower penetration of Kinect compared to Wii in all places, then interest from the current games lineup and experiences ought to peak sometime in 2011 depending on how far that is in the future which I cannot say and the titles which appeal in the intervening time period between now and the current likely peak interest ignoring all future games.
Tease.
