Re: Fact or opinion?
Well, I suppose you could look it up. As for using my own example to counter my opinion . . . it doesn't. We were able to stop doling out Polio vaccines, because we as a society were highly efficient at dosing it, being able to target almost every human being we needed to vaccinate. Unfortunately, there is simply no realistic possibility of matching that type of efficiency with regard to animals, not even close. The large number of unvaccinated animals at any given time negates the possibility of erradication to levels polio was minimalized.
As for some hard facts . . . in my mind, they might be interesting, but they are unneccesary to come to a rational perspective, considering the obviousness of the situation. Comes down to common sense. As you yourself concurred, things like feline Luekemia are way down due to the vaccine. The rub lies in the fact that Feline Luekemia is still prevalent enough that Vets see plenty of it, even if the percentages are down due to vaccination. We simply don't cover enough of the population to erradicate it, tenuous control is as good as we are gonna get with transient and wild populations, who we can't just innoculate by offering free vaccines in schools and clinics like we could for Polio.