This topic is proving a scientific one, more close to my heart.
I think it was correctly stated that dormacy hasn't been scientifically proven to be required, nor has it been proven to be unneeded. Personally, I don't think a statistical model would be suitable for such a test in which so many factors could impede upon it (sub-climate, humidity, water levels, etc) . Merely monitor the temperature from where the plants originated to draw conclusions. Dormacy works for me - my temperatures can drop pretty low indeed. I know that gardenofeden's greenhouse has a heater to prevent freezing temperatures, and this works for him. Essentially, it depends on where you live and the conditions of the area, and also, what you're willing to pay.
Cudos for finding that info.