No, it's not quite the same. I'm actually questioning whether the polio virus has indeed been eradicated if we are seeing other enterovirus cause the same problems, i.e. paralyzation and death.
Again, there are different strains of flu virus. It is true that each one is distinct and not all will cause the Great Flu epidemic of the 1900s. But flu is still a big deal.
Considering that we have enterovirus still behaving like poliovirus and having the same complication of paralyzation, I don't think it's unreasonable to say we still have a form of the thing we feared running around loose.