Monitors with greater resulution than 1080p has bean here for a while, when i bught my pc more than 2 years ago there was quality ips monotors with 2560*1600 and 2560*1440 to buy, since my budget already was tight i got a low quality 1080p tn monitor(mistake). Bluray sacd dvd etc is getting outdated as well. Most pc:s today can play 1080p and beyound. Instead of getting expensive bluray players people will get htpc:s. Streaming and electronic selling is taking over. Lossless streaming and even streaming in 24 bit 96 khz is here http://www.sixmoons.com/audioreviews/qobuz/1.html

I don't know about any affordible 4k monitors but a am sure it will come. I am sure movies with good resulution(1080p isn't) will be more common. The biggest problem with todays movies is the compression. I have spend some time making videos and the size for raw uncompressed fraps files is huge. I made a uncompressed 1 hour long video in sony vegas pro one time but there was a problem, the size was several hundred GB. I doubt video processing for low quality bluray films matters really. Quality upscaling and processing matters for gaming. Ps3 and xbox 360 has a actual res of 640p(mostly). Wii has 480p and wii u will feature true 1080p. Pc gaming is a differwnt story. Multi monitor setup is pretty common, one setup was one 2560*1600 monitors and 2 with 1600*something.

Fun reading:
http://xkcd.com/732/
http://hometheaterreview.com/youtube-offers-4k-video-streaming/