Charging for it is asinine, even for Disney, so I just don't see that.
As to permanent webcams, although it has been done a bit before, if they did it now...I foresee...problems. Given how easy it is to record live streams and such today (anyone can do it), and the troll culture, they would have to be very carefully placed so as not to allow guests to be very prominent appearing in them. If they were, say, at ground level showing Main Street - only a matter of time before there are reports of obscene gestures, and such as people catch on to where they are and intentionally mess with them. Disney really can't afford that type of publicity that would undoubtedly ensue once the media even got a whiff of it.