To OP, i see what you mean and yes i agree with you. The fact of "online retailers are selling out" serves as support to claim Kinect is selling well. But what others have mentioned is we don't know how much. That is also true. We don't know actual numbers. In addition we can't assume that just because it is sold out online we can say demand is exceeding supply. This same concept thread can be made for the Move.
You have a safe assumption and i partially agree with you but you can't force your opinion on others. Some do troll but you have to accept skepticism until actual numbers are released.
e=mc^2
Gaming on: PS4 Pro, Switch, SNES Mini, Wii U, PC (i5-7400, GTX 1060)