Are you sure? When was the last time you actually looked into this? In the past year? Since they found the parasites (plural) that have been infecting colonies and causing hive collapse? Mainly due to the migrating bee colonies people use for pollination.
I'm not going to take a flippant quote from Einstein, from way outside his field, as a guide. Bees are a major pollinator, but not for any real staple food (grains). It's mainly fruits.