What about posting it after the fact? If you were to use a small enough camera (as technology advances, this will only get easier), it's very possible you could make it through a game without getting caught.
Sure, you could have a go-pro or something, but it wont be anywhere near what people will pay for. They want the full overhead view so they can track the plays & the movement of each player - you're still not getting that angle from the nosebleeds.
Regardless, its an awful lot of work which is a) still illegal (therefore risky) b) difficult to market and c) completely obsolete the second the NFL network starts a new TV/online network for it
Well, it's better than nothing. From what it said at the end of the article, it doesn't look like the NFL has any plans to start selling this information to fans any time soon.