Definately interesting. Remember that most plants that are thought of as 'annual' are only thought of as such because that's the easiest way to grow it given the climate in a particular place.
Not sure about the fridge idea though. Maybe better keeping them indoors in as high a temp as possible.
The main problem I see is that when it comes to harvest, it's the nature of cannabis that the leaves die from the bottom upwards so you may not end up with enough leaves to start the new seasons growth. Also, I would imagine that each season would end up with a larger, leggier plant.
Good luck though.