No one. The internet and how the music industry runs nowadays will make it nigh on impossible for any single artist to achieve the level of fame and success that Michael Jackson had.

With music streaming and pirating so prominent nowadays, people have access to a wider selection of music. People who 20 years ago would have been content with music on the radio can discover a deep seeded love for dubstep, post punk, black metal, or variety of other genres. Then their support and money will go to artists in these genres, instead of mainstream top 40 musicians. Music is much more accessible these days, and people are free to develop a very specific taste. Before, people relied on radio and magazines to develop their musical tastes for them because they had no other ways to get music, or even hear about it for the most part.

Even people who do make it into the accepted mainstream of music just will find it difficult to maintain a steady level of fame and riches. People are less and less willing to support record sales when they can easily pirate the music for free. If an album doesn't sell well, the record company won't spend as much to promote that artist's next album since there's no payoff in it for them. The lack of promotion means less people will know the album is even coming out, or that the musician is touring, which means less recognition and sales. It's a slippery slope.

With shows like American Idol and Britain's Got Talent, singers are proving to be completely disposable. The public loves them for one television, and then promptly forgets about them when the next season starts up. Only a few will manage to make a successful, long term career out of these shows.

While the internet might provide many of us with a lot of fantastic music we would've never heard about twenty years ago, it's also the reason the world will never rally around a single band or musician again. We're too diverse and splintered for that anymore, and the record companies know they have better ways to make money nowadays than to try and create a global superstar.

Big D & The Kids Table

Much as Elvis has never been replaced as the King of Rock and Roll. I don't know that anyone but Michael Jackson will ever hold the title as "King of Pop" additionally I think lately the best Pop Stars are women.

If anything I feel Justin Timberlake will try....but I don't think he will be 100% successful. Many people have such mixed opinions on Michael Jackson but ultimately he did some good songs and his videos were always cool to watch may despise what he did or was blamed of doing but his music was still good.

I honestly don't think there will be another on the scale of MJ.