I agree with most that in all likelihood we won't see 1080p piped out either OTA or via sat/cable/fios for sometime, if ever.
I think it is feasible that as 1080p becomes the defacto standard for TVs sold, that in several years a channel or two, like DiscoveryHD or ESPN might consider a 1080p signal. . .might. . .
But, even if this does occur, it won't for several years, so it's really just pure speculation on my part.