well there are states that dont recip now because of the difference in training hours required. so the states that still require permits and training could stop honoring sc permits or worse if sc stops issuing permits then we could lose the right to carry in other states.
Even though you won't need a permit to carry in state SC still will have a CWP program requiring the same training. If someone wants to carry in another state they will have to get a CWP. Reciprocity won't change.