Do I properly understand your argument, like the one below, to be that despite the increase in beehives, there are fewer live bees in the US?
(Before we colonized this place, there were no wild honeybees: they're an introduced species).
Honeybees are livestock, not wildlife.
They can't be domesticated, and containing them after they swarm involves tricking the bees into thinking they are the ones making a decision (you can turn their hive 90 degrees after they swarm in summer and they will return in most cases, assuming they've found a new spot for a hive).
Also, mites (and foul brood) are still a pain in the ass and I can see why bees need a beekeeper to even stand a chance.