I don't think its as big a danger as the Arctic.
The Antarctic ice cap is miles thick. No matter how hot it gets, it will be there for the foreseeable future and will exercise a moderating effect.
The Arctic ice, OTOH, is only a few feet thick. It could all be gone in one hot summer, and it may be permanently gone in just a few decades. The Arctic also has a much greater effect on the N hemisphere than Antarctica has on the S.
And if the Arctic ice melts, the summer sun will heat up the Arctic Ocean so much it may never come back.