Earlier quoted context omitted.
They are in fact not declining. There is no indication at all that a reliable supply of bee-driven pollination service in the US is in any way threatened. You'd be forgiven for not knowing that, though, since the story is presented in the media as if farmers relied on wild honeybees (an invasive species eradicated several decades ago by the Varroa destructor mite) rather than commercially managed bee husbandry.
[Citation needed]
https://www.washingtonpost.com/news/wonk/wp/2015/07/23/call-...
That's the Washington Post noting bee colonies at a 20 year high (a timespan that includes the tail end of the original Varroa epidemic!) in late 2015.
Then, go look up pollination service prices since 2015 --- a trivial Google search! --- and compare them with inflation.