I made a simple economic statement, and I stand by it: The "shall be used for Good, not Evil" episode had a very real cost to it.
People did exactly what you say: negotiated new terms (like IBM) or moved on with their lives and found or wrote something else (like tedivm).
Sure, my million dollar estimate could be way off. But the cost wasn't a small one, and it wasn't just money.
Consider the many developers who saw what looked like an ordinary MIT license and didn't notice the change in the middle or understand the problem with it - maybe thought it was just a cute sentiment. So they made plans and commitments based on being able to use the code. Then their managers made commitments to their bosses and customers. And finally, they all got shot down by Legal and had to scramble to find another solution.
This cost people time and reputation.
GPL and proprietary licenses are different, because they would never be mistaken for the MIT license. A developer could easily find out if they were on the company's approved list or not. And as you know, the GPL itself forbids any changes to its text. So the same problem would be much less likely to happen with those kinds of licenses.