No, that's not the biggest problem. The biggest problem is cVDPV2 (i.e. vaccine derived type 2 Polio). Type 2 Polio is extinct in the wild, but the vaccine derived version refuses to stop.
The trouble is the only way to stop cVDPV2 is to immunize for it - but that same immunization is what creates cVDPV2 in the first place.
Until a better vaccine arrives, it doesn't look like we'll ever eradicate it, Taliban etc aren't changing that. However there might be good news:
"March 2021 saw the first use of the modified nOPV2 vaccine in selected countries. This was engineered to allow vaccination against strain 2 poliovirus without the frequent spawning of cVDPV2 seen with the original OPV2. Full rollout was not expected until 2023."
The trouble is the only way to stop cVDPV2 is to immunize for it - but that same immunization is what creates cVDPV2 in the first place.
Until a better vaccine arrives, it doesn't look like we'll ever eradicate it, Taliban etc aren't changing that. However there might be good news:
"March 2021 saw the first use of the modified nOPV2 vaccine in selected countries. This was engineered to allow vaccination against strain 2 poliovirus without the frequent spawning of cVDPV2 seen with the original OPV2. Full rollout was not expected until 2023."
If that works, then eradication might succeed.