This is an honest question: do you really see no issue in replacing bees with robo-bees? Do you really believe humanity can just technology our way out of every issue we face? What happens when the whole system collapses?
What issue do u see ?
Well, if anything the only time I concern about non-human well being is because it affecting human who care about them.
Most of natural plants will not grow fruit and seeds. Plants will die and so will animals that depend on them.