I got to see Terry Pratchett (a lot) at the Discworld convention last September, and I know he won't be in a hurry to exercise suicide rights (if he gets them). He is doing very well now, is creative and happy.... But he is terrified of Alzheimers (it is terrifying, I've seen a lot of brilliant people reduced by this) and I can understand his wanting to have some say in how long his life lasts.

He was pretty darned thrilled to become Sir Terry!