The problem with starfield is not technical but that the writing is pretty crappy in general. Technical or feature problems can be fixed (cyberpunk or no man’s sky did it) but the story can’t be extensively rewritten without making it a different game.
He could even justify it to the fans as a collab with a well-known author, who would do the bulk of writing with Martin as a supervisor/big picture guy. Like if Jordan had spoken with Sanderson to finish WoT before he died.