I agree it's the greatest movie of all time.
I've often said it deserves a sequel myself, but I'm torn. What would it have been about? It couldn't have duplicated the high stakes of Nazis barreling down while rekindling the fire with a lost love. Where would it have been set? Paris? New York? London? Can't imagine Rick stuck around much longer after what he had done. What would a sequel be about? I'm not sure it would work. I'd watch it though