You could create like a 3rd party like dislike service... That sends two requests one to YT and one to your 3p service that stores the count in a redis key value store with the id of the video and the count.
Unless you get 95% of people to use such an extension, it will be mostly useless. And if somebody succeeded in getting 95% of people to use their extension, they would sell it to the highest bidder in a heartbeat, as has happened many times before. YouTube is dead, it's time to create something new.
I kind of agree... we need a new YT
why only kind of, do you have apprehensions?
Today I learned that any statistic created using <95% of the population is invalid
Or a subset of people that are like-minded, whose votes you value more than the general youtube population en mass.
I think you are overestimating how many people care about the dislike count. Of course there's a bunch of people who are loud but I doubt most regular users care.