What ESR notably underestimates (or at least does not mention) is the protection the GPL offers to its users, not the developers. No other licence gives the user of a piece of software so many Freedoms. Replace the GPL, take away the Freedom, and the some person is using some piece of software which he can no longer, modify and share, with his/her friends.
It's not the point if Developers need the GPL, WE need the GPL !
If I were a grave-digger or even a hangman, there are some people I could work for with a great deal of enjoyment. -- Douglas Jerrold