So going by that theory, if I write a book today and do the digit flip, it's still 2000.... unless it's 0002, now there's an idea!
Scco8b, I recommend finishing the book, but just be prepared for that awful ending.
As for the ending, I don't think he's executed. The point of not killing him was to avoid making him a martyr. With his will broken, however, he is no longer a threat to Big Brother.
One thing, though, is that they use his fear and his attachment to what's-her-name to break Winston. Could there be a hero who is able to overcome his fear and weaknesses? Who can rise above Big Brother's power? I am being optimistic, and trying to look for a way to win. Even super-powerful societies crumble.