In the long term, quality will improve, in tiny marginal steps. The company already talks about that extra $1 for fact checking; but if another company is doing the same thing, and starts ranking higher, there will be pressure to increase quality. (That is, assuming the ad-clicks are worth fighting for...)
It occurs to me that Google's pagerank is out of date: today, few people will add a link to their webpage/blog to one of these $20 videos, so pagerank can't rank them using links. (this isn't a danger to google; and their algorithm already uses many factors other than links). It would be a valuable to rank them somehow, using the behaviour of users. How to do that?