Though you said
nobody watches it, in the home is dead?
and
last weeks
Looking at Guardians of the Galaxy, American Amazon has a blu ray edition for $27 that includes the 3d version, the 2d version and a digital version. They offer no 2d bluray only option. In the UK Amazon there is a 2d blu ray version and no 3d version at all for sale.
Sales of 3d versions of a blu ray are fairly meaningless when often you can only buy a version of the film which bundles the 3d version even if you won't watch it.
Ultimately the almost universal comments I see on reddit, other american forums, english forums is this, 3d occasionally looks good, is more often than not a hassle and almost no one bothers with it at home.
When people choose to now and then go to the cinema, they are also choosing to sit still for a couple of hours in one seat and all watch something that can't be paused. You're locked in so putting on glasses doesn't really detract from anything. At home, watching tv with friends of family much more regularly no one makes that same commitment. Maybe you're talking with friends, playing with your cat, reading a book or looking at a phone. Someone cooking in the kitchen but also listening to the tv and keeping an eye on a game. It's just not convenient to wear 3d glasses for casual viewing which is why almost everyone in every one of these threads says they don't watch 3d at home even if they are able to.
I have 3d films due to buying blu rays that include it, I've watched ONE when I first got a 3d screen... I disliked it, haven't tried any since. I feel like the gain of 3d is so minor it simply doesn't outweigh the inconvenience.
Because of the way content is sold there will be 3d film sales, it doesn't mean people are watching films in 3d often or indicate growth in usage of 3d content at home.
3d now seems to be rather like the Valve Orange box, you already owned HL1, 2, episode 1, but rather than pay £20 for episode 2, you saw £25 for the orange box with all the parts together as better value. Ultimately on 8/10 sales they just made £5 more than they otherwise could, most people just had duplicate copies of games. 3d the same on those American versions of GotG, rather than a $20 2d blu ray, sell a $30 version of the film only but with more 'value' by having a digital and 3d copy of the film. It's still only one film and most people will watch the 2d blu ray but you still got an extra $10 out of those guys anyway.
EDIT:- looking at a price history thing the 3d/2d/digital pack on Amazon us started at $30, dropped to $25 a few days after it was available(before xmas) then went back to $30. The 2d only film started at $20, went up to $25 after a few days, then went back to $20.
Ultimately they use pricing to push sales towards the higher pack, get a crapload of early orders then move then $5 apart again to generate more 'value' for the version that includes the 3d and digital version. Honestly the majority of people buying 3d versions are just in case or value buyers. If those versions came with only the 3d version their sales would be utterly horrific.
