Why must it be for reasons of paranoia and not just basic privacy and the avoidance of annoyances you did not ask for, pay for or want?
Or are you one of those many people who say "If you have nothing to hide then it is ok?"
Example:
We all hate the fact that cookies track your web behaviour and can lead to often poorly and annoyingly targeted ad's, yes? Well this kind of technology has immense potential for Targeted Advertising, to just scratch the surface.
In as much as being able to detect if anybody is in the room watching TV. This would be a premium 'slot' I would pay for if I was an advertiser and had the budget. Playing a certain Ad to a guaranteed occupied room potentially carries premium revenue.
Also being able to detect if they audience fell within the parameters of adult, male / female, or child size, is equally useful and just a tiny example of the potential. Playing a certain Ad to a guaranteed demographic also potentially carries premium revenue.
The same with Ethnic / non-Ethnic advertising. Remember when the early Kinect system could not recognise many dark skinned users? Well they could turn that defective anomaly into a positive use... LOL!
You still may say that all this is ok. However, is it something you would want to buy a premium product for?
If somebody wants to put an advertising poster on your front lawn for free, will you allow it? And if you are going to allow it, are you going to pay for the board for which the advertisement will be posted to?
That is my main point, in regards to a TV with this sort of technology. It is not something I will want to pay for or allow.
Of course the Apple TV set will be a Trojan Horse in regards to the above.
It will have all the 'bells' and 'whistles' and 'shiny' to attract the usual sheep, who will be so dazzled by the gimmicks that they will totally forget any security issues, or breaches of privacy when they plug it in and click the "I agree" tab on the T&C's. Just look at Google Glass.
There are major security issues with any camera directed at you connected to the internet. Paranoia is not a requisite to acknowledge that fact, although it certainly helps!
P.S. Just because you are not Paranoid, it does not mean they are not out to get you....