Just as an aside, I'm wondering what is the future for HDTV? Right now, we have Blu-ray disc which holds 1080p, better than TV broadcasts which are 720p/1080i at most. HDTVs are 1080p at most. What happens over the next 20 years? Do we get HDTVs that are 8-megapixel, like 4 1080p screens together but still only 720p/1080i TV broadcasts? Therefore the only way to make the most of these 2160p TVs will be by a new form of optical storage with media encoded at 2160p?
Will that keep happening - that TVs get stuck at one resolution and other media jumps ahead in leaps and bounds with the two only achieving equilibrium every 30 years? I suppose it's hard to tell as TV has come such a huge way in the last 50 years with colour, widescreen, HDTV, etc. that it's impossible to predict the next 50 years.
I believe that in Japan they are testing/using broadcasts which are over 1080p. Don't remember the exact details though.