The more I think about it, the parenting metaphor he used is completely apt once I get past the surface implication that "our characters are our children" and look at say the difference between stricter and more lenient parents (as well as the level of parental control that's going to be exercised once the kids 'leave the nest' as it is).

Obviously fanfiction is not going to be anything the GRRM is ever going to want for his character, but I doubt J.K. Rowling loves her characters any less for allowing her fans to write fic about them.