I'd need to double check but I thought I had read that Australia recently gave up on the harsher measures they had in place to try to keep Varroa from gaining a foothold, because they were getting so much spread that it was clearly not going to stop the little f'rs.
Beekeepers are dealing with Varroa as best they can and the mites are definitely a huge drag on hive health but this year I've heard more beekepers worried about imidacloprid use on crops/crop seeds, getting into plants, and from there stressing and killing hives. Sounds like an 'overhyped pesticide' problem in that, ignoring its effects harming bees/insects, it doesn't seem to increase yield but everybody's gotta have it anyway. Naughty Bayer.