Raven
Corn!
I know that writers can't write 24/7... but I do think that some things (like trying to finish the book that he said would be out last year) should come before others (like making asoiaf miniatures).
Well, it's not like he's making each individual one personally. All he's done on the miniatures is approve the firm making them. Unfortunately there were some complications.
I must admit I think GRRM would be better to leave most of this kind of thing to someone else, but he doesn't want to do that: he wants to have a level of personal involvement with the merchandising, so that he is happy that everything put out under the ASOIAF 'brand' is something he personally would buy if he were a fan.
The thing is that when nothing goes wrong, this sort of thing isn't a huge demand on his time (see the art book, for example: all he had to do was approve the art that went in, basically). But when something does go wrong (as with the models) it not only eats up time but is a mental distraction too, because of the stress.
I feel like he'll start losing fans if he only turns a book out every three years at the earliest.
This is unlikely to be much of a problem. Numerous best-selling authors go much longer between books than three years. And AFFC was the best-selling book in the series to date, despite the gap of five years from ASOS.