Dragonmount might eventually erupt at TG (probably SG as well). After all, Dragonmount seems more active at the moment. And since the DO can manipulate nature & reality more and more, it would make sense for him to let Dragonmount erupt to cause more chaos. Plus, Ishy showed Carridin in his visions that "the earth split open and fountained molten rock" (we know that many of the other visions pretty much came true, too). If such an eruption will really completely destroy TV remains to be seen, though, especially considering the mention of Great Aravalon in one of the 4th Age texts.