I just had a thought... Since D* is working with CE people here, and most CE people are interested in MRV, wouldn't that mean that most CE users have ethernet connected to their receivers? (I can remember one user that has his directly connected without a router, but I can't remember his name at the moment... sorry) Couldn't they have an option to have the receiver get it's guide data via the ethernet cable in 10 seconds instead of all night? Then if that didn't work, revert back to the old way and get it from the Sat? Seems to me that wouldn't be very hard to do... alot less work on the receiver if it gets little pieces all the time...
I would suspect the guide is very big, given the 1000 or so channels with detailed program info for 12 days or so. Plus server demand, I believe staying with the download via satellite is a better way.
Also consider that around 10% or less have ethernet connected to date. (guess)