Good point on the mobile games. But yeah, they actually probably well just do a big Warcraft stream that is both the new expac and those games to get big investor checks.
Azeroth is almost 99.99% guaranteed based on what has been said in interviews, it's whether or not its a Cata 2 revamp type thing that is the big gamble.
Considering the Shadowlands leveling campaign is almost completely irrelevant to World of Warcraft for beginners that is another point on my board for a leveling revamp. There is no reason to force players to play Shadowlands after the expansion has concluded because the plot is not tied to anything in the future.