Well, I'll say this.. If This Is It had happened, and Michael released an album during or after the tour, it would have sold like hotcakes.. When you watch things like the World Music Awards in 08, or when you hear that 1 million people registered for pre sale tickets for the this is it shows (enough to sell out the O2 ANOTHER 50 times) After the press conference, OVERNIGHT, sales of Off The Wall rose 200%, Bad rose 110%, Dangerous rose 165%, and Thriller rose 155%. When the Pre Sale of tickets actually began, 2 websites offering pre sale tickets literally crashed, and over 2 million people tried to buy pre sale tickets in 18 hours. Tickets began to appear on ebay for over 15,000 dollars. If the shows would have happened, numerous records would have been broken including "The biggest audience ever to see an artist in one city", "The most amount of people to attend a series of arena shows", "The fastest ticket sales in history"
The world wanted MJ back, this is obvious. If Michael would have released an album at this point in time, I think it would have easily sold (at the very least) 17 Million copies.