I guess I'm just in the "bigger the better" mindset.
I'm currently in the process of building my own 6/7 bedroom house, with a dedicated cinema room. I'm doing most of the work myself, with my Dad, so it'll take 2 years or so. My wife and I have two kids, with number 3 on the way. We want a few more, maybe 10 altogether. So my cinema room will be a family cinema room, not a mancave. I can't wait to sit around with my wife and a bunch of kids, watching an 80+ inch, or someday 100+ inch TV, in the comfort of our own home.
Yeah, we're just polar opposite on that. The fiance and I loathe kids--just got my second post vasectomy analysis today and I'm shooting blanks so that's all taken care of! )
And we both like keeping our carbon footprints reasonably small (though we're not uber obsessive about it as we both like the A/C pretty low etc.).
We're also more go out and do stuff people (be it hiking, walking the dogs, museums, eating out, drinks out with friends, concerts, sporting events etc.) rather than lounge around the house types. I like gaming and reading, curling up with her to watch a movie or show etc., but given the chance I'd rather be out and about doing things than in the house vegging out.
And yeah, on the media format, physically, HVD might replace blu-ray, but hopefully streaming continues to grow. I don't like having an unnecessary physical collection either. I got rid of my DVD collection years ago, and have never even bought 1 blu-ray of anything. Digital copies and streaming all they way.
Yeah I'm pretty torn on that as movies are the one thing I do like collecting. I still have 180 some DVDs and 190 some Blurays. But I am sick of the unsightly racks. I'll probably shell out and by some nice media cabinets with doors on them when I move--I need more capacity anyway.
But I am buying a lot less--just mainly because we're not re-watchings all that often, preferring to watch something new from Netflix disc rental or streaming, Amazon streaming or grab something from Redbox. Watching something for the first time just can't be beat by a re-watch--assuming I like the movies equally of course.
Do remember thought that the lighter these sets become, wall mounting them gets even easier. Most people, even in small apartments, have 70 inches of wall space.
That's not the issue really, it's more whether the rooms big enough to sit far enough away from that big of a screen.
For instance, the front of my couch in the living room of my apartment is like 7 feet from the opposite wall--and that's the only way to set the room up as one end is an open kitchen and the other end double sliding doors onto the balcony. So I can't really do bigger than a 60" set in here--maybe a 65" without being too close to it to watch comfortably. I'm happy with the 55" one I have for now as it's a nice size in terms of being plenty big, and not looking too big for the room.