We can always just replace bees with robotic replacements as soon as technology allows. What could go wrong?
However it's already a self-sufficient efficient eco system only if we could stop deliberately destroying.
What happens when birds try to eat the fake bees? What happens when they break? Do we just leave them there? What would their batteries made of? Any dangerous material Lithum is not something you want on your water supply
That's why we need robotic birds.