That seems much more sensible than what is being discussed. Sure fair use offers some protections, but youtube the platform is not required to protect individual youtuber revenues for fair use. Fair use effectivly entails an exception to the normal rules, and as such, requires actual judgement on a case by case basis instead of being something that can be scaled like content id. If you actually got sued, you could use Fair Use as a defense in court, and the judge would decide if you are right or not. In the case you are discussing, no-one got sued because youtube handled it without a court, so fair use never really comes into play.

What is being discussed would be more like if a court tried to get Google to take down individual spam bot youtube accounts that had popped up that same morning. Its rediculous because the legal system doesn't move that fast (nor does DNS), so things that require that level of heavy-handedness are typically much slower processes taking months or years.