He's just not into it. If he continues to force himself to do it, the end result will probably be a pretty terrible book - and I think he knows that, and that's why he can't finish it, because he doesn't want to publish a bad book.
Like so many other unhinged fans of A Song of Ice and Fire, I'm basing this purely on vibes, and Martin does love to troll all of us by posting oblique productivity quotes and tagging them with the word "writing," suggesting that he's quite merrily chugging along on The Winds of Winter.
I realize this is a controversial opinion amongst fellow A Song of Ice and Fire fans... Instead, I feel the complete opposite.
[
Collection
]
[
|
...
]