First, wild honeybees were not eradicated by Varroa. There are many papers written and researchers who have studied substantial wild honeybee populations for decades, and chronicled their decline and resurgence to pre-Varroa numbers. What has happened over the last few decades is that wild North American bees have adapted and are thriving, while 'babied' commercial bees are struggling.

Second, the number of commercial bee colonies for pollination services is not declining because beekeepers can choose to focus on making more when they need to. A reliably-consistent number of colonies can exist whether 5% die out every year or 50% (although at different cost). Having said that, what IS declining is the annual survival rate of colonies, which is linked to many factors, of which pesticides likely play a part. This is a not-so-subtle difference. Just because it doesn't immediately threaten commercial pollination doesn't mean there is no issue.