We know he has a specific destination in mind. It’s well established that he had an outline for what was originally a trilogy. It’s why the first book is heavier with hints of (for example) Jon’s lineage than the others.
How to get there has clearly changed, and GRRM might not know how anymore.
You’re assuming GRRM knows where he intends to go. Or more importantly, how he intends to get there.
We know he has a specific destination in mind. It’s well established that he had an outline for what was originally a trilogy. It’s why the first book is heavier with hints of (for example) Jon’s lineage than the others.
How to get there has clearly changed, and GRRM might not know how anymore.