Earlier quoted context omitted.
The simplest version would be a drone holding a paintbrush. Could do that now. China is one of the cheapest places to make suitable drones. Yet Chinese farmers are currently using paintbrushes.
I suspect that the reason is cost or just not good enough, but overtime it can be improve and price can go lower. So at least for me, I don't see reason to not just let bee extinct. Keep in mind that the cost to keep bee not extinct might be higher and higher.
Then I really can see no reason for you not to be forced to spend your entire life pollinating plants by hand with a paintbrush. And this goes even if there are still enough bees. We will let them watch you work while giving them little cups of honey.