Personally I am for foiling in the A cats. It seems to me that the only way to effectively ban foiling in the A cats is to make a rule prohibiting lifting surfaces in the back of the boat, i.e. require straight rudders. The I-14 class uses a similar method to prevent foiling 14s, they only allow 1 foil with lifting surfaces and limit the area.
Have to admit that the method the I-14s use is not insurmountable but is pretty hard to overcome. Perhaps this is a way the A-Class can move forward with some sanity