Displays usually last over 10 o 12 years, obviously depending on what technology is being used, but these days, they are always coming out with more enhanced displays, slimmer, more features, etc. So, the average person will upgrade their TV about every 7 years.
Before 720p was common, now people are moving to 1080p. Color accuracy? There are many things people will look at other than color accuracy.
If you want a little more knowledge, might i suggest reading the better audio/video magazines that actually do a better job in reviewing products. Some of these magazines like Consumer Reports or other mags actually don't do a very good job in reviewing products. Consumer Reports doesn't usually review the upper end of the range. So, it depends on how much importance you have in video/audio. Some TVs may do 2D well, but 3D not so well. Some look OK in the store, but when you take them home, they might not perform like you expect. Lighting conditions will alter how well the TV will perform and most of us don't have optimal lighting conditions, or room acoustics unless you have a dedicated home theater room that professionals have gone through to ensure optimal lighting and acoustics for optimal performance. Some people quite frankly, don't really care.
Apple, life everyone, has to figure out what market they want to go after and what is considered to be high quality and what price range will yield enough sales to make it worthwhile going after that market.
I just hope if they do go after the TV market that they do their homework and really get some experts to assist them and they compare against the REAL high end but make them affordable. Good luck!! :-)
Magazines I found useful to read Stereophile/Home Theater , The Absolute Sound/The Perfect Vision, and Secrets of Home Theater/Higher Fidelity are good sources for reviews. They are usually reviewed by serious minded people and do fairly in depth reviews, but again, use them as a guide and resource for knowledge. If you read a magazine review and the review is less than 4 pages long, that is usually a Press Release review and they are basically regurgitating the company's website and are superficial reviews. Some of these magazines have their reviews on line.