I do think there were people who wanted to pull success away from Michael after the 90's because they felt he wasn't as valuable anymore and could poise others to achieve today's version of 80's record sales success.
But if you look at various reports, Thriller has sold between 50-110 Million copies. There is discrepancy, I'm not really sure how many it really has sold, in "Michael Jackson's Private Home Movies" in 2001/2002, Michael says Thriller sold 62 Million records. If that's true, there is no way it sold a further 42 million copies by 2006 when Michael said after getting the Diamond Award Thriller sales stood at 104 Million.
But if you look at various reports, Thriller has sold between 50-110 Million copies. There is discrepancy, I'm not really sure how many it really has sold, in "Michael Jackson's Private Home Movies" in 2001/2002, Michael says Thriller sold 62 Million records. If that's true, there is no way it sold a further 42 million copies by 2006 when Michael said after getting the Diamond Award Thriller sales stood at 104 Million.