I think I got into this business right around the turn of the century. Everything was analog for video, and the only way to get HDTV was on a couple of DirecTV stations or over the air. It was like the old days of TV. Lots of repeated shows and very little content. 1080p didn't exist for anyone. Line doublers from Faroudja were $10,000+ and plasmas were using rectangular pixels with 1024x768 resolution in a 16:9 setup.
Now we have every other person complaining that their new 4K TV doesn't accept HDMI 2.1 120hz signals and isn't capable of downconvering 8K video to 4K like they just 'should'. It's next level. It's almost as next level as the number of displays that actually are capable of performing such cheap parlor tricks.
As a big fan of front projection, what I've seen happen in the last 20 years, as digital projectors came in and easily replaced my 3-gun CRT projectors, was the incredible growth at the low end. The idea that for well under $1,000 you can get a full 1080p projector that has enough brightness for a 150" screen in a dark room and will deliver solid colors, decent black levels, and very good motion would have been unheard of when they hit the market.
I can't wait to see what we get over the next ten plus years.