You may want to check your numbers because polio type 2 and type 3 are both still around (in fact, cVDPV type 2 is very, very common). The GPEI website has the recent numbers, updated weekly (although with ~3 month lag).
400k to 4k is not 400k to 0. Eradication means 0. People don't get smallpox vaccines today because we hit 0. American children get ~4 doses of IPV still, despite what you are claiming as "eradication."
