If you don't see the significant value in including video content, then I would suggest that you don't see the significant value in including photographic content either. I would suggest that's an outdated value system.
You're simply extending my argument too far there, which is just bad rhetoric. Images and video can have significant value. If we wait a reasonable time (250 years?) these problems will naturally be solved, and our archiving systems today are so good I am unconcerned at having to wait that long.
But the minimal advantages of linking to copyrighted videos on Youtube right here and now is, I feel, well outweight by the far more important values of free and properly licensed content.
Of course; if you are able to provide some specific counter examples (this is fairly off-topic, so perhaps a new thread?) I'm happy to reconsider my own view!
Tom