Well, despite the mentioning of the poor quality, I sort of assume you intend to imagine what it would be like if we had quality technology for posting videos, and that is actually quite a scary thing to think about. I mean, good lord you are talking about my spring breaks back when no-one had a cell phone especially any kind of camera and now you want the chance for video? Way too much information would be put out that thankfully has stayed in a purple haze of drug and alcohol soaked memory.

The phrase "hold my beer and watch this" would be a dominate on its own genre.

MTV came out in the 80's so the quality of videos would be much lower.

Well, it would start with "Video killed the radio star" by the buggles and steadily go from there

Ever seen the talking heads ?

Black and white :)

Well Video Killed The Raido Star would be on Youtube

Crappy quality, dial up internet you know :)

I imagine it would mostly be the same. Cute cats, vlogs, hair and make-up tutorials... No Let's Plays. Video quality would suck.

Grainy crap sound and lots of big hair doo's