How are you destroying "masterpieces" by offering audiences options on how they watch entertainment? I've seen no one in favor of 16:9 versions saying that the 4:3 versions need to be burned.
You're arguing that that the show needs to be cropped/edited to fit a 16x9 format because future audiences will not tolerate watching it any other way. So if you do that then you've, effectively, "destroyed" the originals since now no one will watch the originals they'll watch these ones that "fill their screen" and meet their expectations. Sure the original versions will still "exist" but in an outdated format and likely in an outdated media with no player for them if we're talking about truly future generations.
If the only thing available to watch is this new format then, yeah, you've destroyed the originals because they no longer matter they might as well be destroyed.