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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.