I'm always offline, Bethesda does release the DLC in disk form (see Fallout 3 and Oblivion, thought it is on a delay... You will get it eventually, the DLC disk (not returnable to gamestop, they learned the hard way) or GoTY (which i buy, download, then return or gift)
hope it helps
Okay, that's good to know.
But, one more question, is there any way to download the DLC offline (silver) to make it easier and faster, or no?