So far it looks like AI will go the same road as other technological analogues of biological systems: not a self-contained unit (powered by currently technologically unreachable nano-mechanisms), but infrastructure that produces and maintains specialized units.

A tractor can't reproduce or repair itself, but it is better than a horse for farming. A self-driving car can't learn by itself, but a datacenter can use its data to train a new version of the car software. A humanoid robot by itself might not be flexible enough to count as AGI, but it can defer some problems to an exascale datacenter.