I'm pretty sure they will be flipping burgers by the 2040s, if not before, and doing everything else needed to efficiently make a (big) percentage of people jobless in first-world economies. Though, not in parts of the world where electricity regularly in the wire is still rare...because those problems don't solve themselves in a few short decades.
Now, we both are cynics and should go for a beer together. Who knows, maybe we will come up with a more catastrophic and highly probable scenario that combines your outlook with mine...