You do realize that at 1 hour of use a night, that 1000 hours is going to be close to 3 years? And it's going to be 2000 batteries through that light. By the time you've used the light to that extent, you've truly gotten the most out of it. If it does fail due to the LED going dim, burning out or something, I am quite sure you can contact SF, tell them the LED module has dimmed significantly or burned out, and they will take care of it for you.
Besides, there has never been a documented case of field failure of a Luxeon V here on CPF, whether in Surefire, custom, modified, or any other light for that matter. Don't worry about it. How likely are you to use up that many hours?