Upvoted for disagreement. People are inventive and resourceful. They have explored "organization space" pretty thoroughly. Many successful alternatives to corporations already exist and are functioning successfully. Any corporation producing "astronomical waste" will quickly be destroyed by corporate or non-corporate competitors

Upvoted for disagreement, but this sounds interesting. Say more?

Voted down. Note that my interpretation is that your 'human-level intelligence' clause allows for tweaked uploads which could be almost arbitrarily re-engineered without exceeding human-level intelligence (for example, an organization made of the same mind replicated many times would be able to almost eliminate any internal controls, checks, balances, loafing, cheating etc. which take up so much of a modern corporation's energy). I think there could be far more efficient structures and minds optimized for them rather than monkey packs.

This says nothing about whether such organizations will come to exist, outcompete existing corporations or organizations; they may just be known as a possibility before the Singularity happens and renders the question 'what is possible with merely human-level intelligence' entirely moot.

My liberal roots are telling me to hate corporations and agree with you, but I don't think that actually constitutes agreement. I'm also curious to hear more.