I wouldn't agree that his "legacy" is fading. Hell, he's still one of the most popular movie stars, 27 years after his death, as evidenced by the millions of his DVDs sold. And his memory will probably outlast most of us posting on this board. Nope, I think old Duke will be around for quite awhile.
Nearly 30 years after his death he's still number 3 on the most popular actor list and I'm sorry, but with the competition he's up against, I can see no reason why he won't be no. 1 next year.