I'd prefer uploading videos as opposed to just watching youtube, but either or both would be a positive.
I think this'd be an awesome customization feature for this game considering we also still have the ability to add our own images to the game. I'm assuming that one thing that might be preventing this from happening is due to the ability to upload houses to mod.io. It would probably make the file size much larger, so to that I say probably keep it as a personal feature if possible to prevent file sizes from getting too large.
It would make your home office that much more... well... homey... since we now have moving pictures on TV.
It'd be cool if this could be extended to the computer monitors too, but I'd be ok with just the TVs, at least at first.