AirRabbit, interesting take on the Air Florida case.
All wings are unstable in pitch, the centre of lift moves forward as the aircraft pitches up. If it moves too far forward on a less stable wing, especially one with a wide chord, it can exceed the pitch authority of the elevator:
(Perhaps especially if a close taxi to an aircraft in front melts some of the ice on the inboard wing and not the outboard sections?)
... it would be interesting to see some research on the amount of pitch up moment a 737 could develop under those conditions for me to be convinced, though. I think it's certainly worth that research.