LTCX, I think you covered perfectly what a captain should be doing on every landing when he is PM. I too had to take control at 30 ft on a B737, flaps 40, when the FO selected idle power at Vref. Adding power saved the landing gear from going through the wing or at least causing significant damage.
That was the only time I physically had to take over an airliner from the PF because talking wasn't going to save the situation. Most of the time a bit of advice is all that is required.