Maybe I just watch movies different from most folks. I watch it once, then, in a couple of years, I might get it out and watch it again.
For that, only being able to watch it in one room isn't a big deal for me.
If someone was smart, they'd create a website designed around selling/trading the "extra" discs that come with these sets. I mean, if I bought the 3D version of Avengers (~$35) and sold the DVD for $5, the Blu-Ray for $5 and the digital download for $5, then three people just got a pretty darn good deal and I just cut my cost nearly in half.