So I have an Xbox One S and an 8TB HDD (humble brag) and I'm upgrading to an Xbox One X next week. There an option to update games early in the settings. A few of my games have already updated via random downloads. Probably one per day. These aren't small updates, though!
Quantum Break now tops 100gb and that doesn't even include the 70 something GB for the TV show. Just now, Halo 5 started a 15GB just update that'll push it near 110GB when all is said and done. Gears 4 tops 100GB and Titanfall just jumped to almost 70GB yesterday!
Like I said, I have 8TB and I know about the settings. There's going to be some gamers with 1TB internal (which will probably be more like less than 800gb usable for games). AND they're going to have to download a fuck ton of updates on day one.
I foresee a lot of unhappy gamers--at least on that first day or two.