The people likely to be remembered are going to be the people who contributed most to the things that will define the 20th century in history books.
communism, nuclear power, the computer, the internet, the space race, the relative end of imperialism (although it does still exist), the fight for gender, religious, and racial equality.
This leads to: Hitler, Mao, Lenin, Stalin, Ghandi, Castro, Steve Jobs/Bill Gates, Armstrong, Oppenheimer, Che Guevara, Mandala, etc.
But really, the question is subjective according to world region or country. Let's face it, the US is more concerned with entertainers than leaders of other countries. It wouldn't shock me in the least if Elvis, the Beatles, Madonna, and Michael Jackson are remembered more than than people like Che and Ghandi, because of of our fixation with pop culture. We'll remember Hilter, Mao, Lenin and Stalin because of the communist paranoia.