Given that the costs will still be present but Google won't get any benefit for hosting these videos, how likely are they in the future to simply delete them?
You seem to simplify quite a lot. Costs should go down with videos not being recommended and thus less watched. Not excessively oppressing their users should be a benefit. Sure we could find more of both costs and benefits and I wouldn't be sure about the resulting score.
I also wonder how much it will cost to classify a video versus just hosting one of those average and barely viewed videos.
