I think the home is starting to turn into the movie theater. It's fairly common to see 4k 55" TVs in people's homes; I'm wondering how far they can take the sizes for a residential area. The accompanying sound systems for these home theaters are high quality as well. I guess it's an arms race to out-spectacle what you can get out of an increasingly performant screen from Samsung, et al.
This is a good point, the experience at the theater used to be drastically different that what you'd get at home (VHS, non-widescreen, stereo audio, etc), but the gap is certainly closing. Combine that with highway robbery concession prices, being surrounded by a bunch of strangers... the theater is starting to look less appealing.