Perhaps dragonfire includes a lingering corrosive property that doesn't wash off. That would cause the stones to melt over a long period and prevent the building stones from being reused. Or perhaps GRRM hasn't thought through many of the implications of his timeline. Considering that he has trouble preventing the proliferation of viewpoint characters even with how fast he kills off characters I'd pin my hat on lack of authorial thought.
(no subject)
Date: 2012-04-24 02:22 am (UTC)