There will probably still be some SD reuplinks. Isn't HBO already on X4? The HD feeds will probably be history. If NPS gets a working IPTV solution they might be able to offer HBO HD for cband, but it wouldn't be 4DTV compatible.
I think there's a pretty good chance the HITS feed on X4 will still be there. It will probably be a down-rezzed mpeg-2 conversion, but I doubt the small cable companies that use those feeds will be able to swap over to mpeg-4 any time soon.