By "pretty much there" I mean we have the fundamental components already mainstream. Do a search for wirelss cameras. You'll find a ton of them for sale. These can even pan/tilt/zoom by remote etc..., a device the size of that camera for viewing, well just look at your cell phone. The basic tech is there. A specific product with it all together no. (Thus my "Assuming they one day build this")
If you say you're going to build a camera with wireless control,, the tech is pretty much there. (Still an awesome device) You say you're going to build a camera which can take a pictures of whats left and right of you at the same time, not really new tech: it's building a camera with 2 lenses two sensors etc... Build camera which can hover around and follow you, taking pictures of everything as seen through your eyes, whenever you think "click".. well now you're pushing the boundaries of what is our current tech. Again though, I'm not putting down the device, I'm just pointing out that it is not a far fetched idea just a really cool one.