Well, without radically changing the economic system, your compensation will be, at most, the cost of replacing you, and the gap between your compensation and that figure depends on the information gap, and the chutzpah with which you negotiate.
I'd wager that if developers renegotiated their contracts at the point where they were most irreplaceable on projects they would be able to extract a lot more money.
I'd wager that if developers renegotiated their contracts at the point where they were most irreplaceable on projects they would be able to extract a lot more money.