It is a good plan for a real winter like we're having right now. However, the last 2-3 winters before that have been exceptionally mild. Imagine what your yard is going to look like during a warm winter - 40 hives plus however many hives you have at home flying and looking for nectar sources. You will have major robbing and the bees might start bugging you and your neighbors.
In my region 40+ hives is a lot to keep in one spot.