Things get better as time marches forward. When DVDs came out folks thought that was the best as it was going to get, now comes HD-DVD/Blu-Ray.
If you truly think things are just going to stay static you are fooling yourself.
Technology is improving every day. I remember when a 1GB hard drive was a big expensive deal, now you can carry a couple GB around in your pocket. And that has been less than a 10 year stretch.
No I can easily see quality HD movies and TV shows being downloadable, hell I bet streaming will up to good quality, in about 10-15 years.