Not sure there's such a thing as a one-man empire anymore, a company of Apple's size and complexity is assuredly filled with talented developers, managers, designers, etc.
But at the same time, I do agree, a lot of AAPL's inherent value was tied to the vision of its founder, and his ability to go into stagnant markets and figure out how to earn ridiculous profits.
The music, movie and home computer industries were all in decline back when it was all about CDs, shitty MP3 players, renting stuff and Blockbuster and buying a shiatty Windows Vista PC. Not sure Tim Cook has the balls to challenge his talented people to do better, deliver more, make the experience seamless, etc., the same way a guy like SJ had.
Similarly, avoid WWE stock, it's going to hell once Vince McMahon bites the dust