I suppose that's true, but $100 million is a pretty tidy chunk of change for just 2 movies. If I were him, I would have asked for more, something like $175 or $200 million just to see how desperate they were to have me; I'd see it as a win, win situation with no way to really lose. If they refuse and tell me to take a flying leap, no loss there since I didn't want to do the movie anyway, if they agree then I have the satisfaction of knowing just how desperate the studio is and I managed to take advantage of that desperation and score myself a big pay day.
Actually, I suppose if I wasn't just bloody sick of playing the character and being the public face of the franchise, I'd probably say "I'll do it for $125M, and creative control with respect to how my character is written and acted." If his issue is that he's been giving weak material, I'd say demand the ability to make the material better.