I loved his acting as much as anyone, but I disagree that it was necessarily a sad day. He was, after all, 83 years old. He beat the average life expectancy in this country by a wide margin. He made an impact on a huge number of people, as well. He was ready to check out and move on. Really, what could you reasonably expect an 83 year old man to do beyond this point anyways? I'm happy for him and all he's done.
Dying old beats dying young I guess, but dying sucks overall. The only ones "ready to die" are those where age or illness has already sucked the life out of them. I'm not going to chase the singularity or cryogenics or any other mumbo-jumbo promising eternal life, but heck I hope I'll be like this when I'm 89.