So yes, they are commodities, but if they are a lot of them, and a lot of work to go around, wages rise. We saw this with the industrial revolution, especially assembly lines. Mid 20th century you could live pretty well as an unskilled assembly line worker, but then the work dried up.
Most modern work, knowledge work, hasn't been turned into assembly line yet. Many would argue that's because it can't be, but I disagree with that, much of enterprise software is about turning it into that (workflows,processes). It just requires more of the same. There are actually very few cloud labor startups (mturk, crowdflower, mobilworks) with at most a 100 programmers, one reason being that it doesn't have the network effects moat that VC's look for. Robotics is another casualty of that. How do you defend your cloud labor,robotics company from competition? That's why it will have to be built from the ground up by bootstrappers.