Anyone else have a funny feeling they will shoot the final book in TV form before the final book is written? Seriously? Script writers probably just need a direction and can take it from there. I firmly believe, before they spent money on production 1, they had the complete story line start to finish, just like with the Jordan Series, "Wheel of Time". Jordan died before the last two books (well it was suppose to be more but they ended it with 2) were written. Sanderson (sp?) under contract to the book publisher finished the series for Jordan post mortem off of his notes and did a great job.
I wouldn't be too concerned on "if" Martin lives or dies. Particularly, if he was an attendant at a certain wedding.