It's success will not be emulated even if better games (Like; Apex Legends from Respawn/EA) come to the fore.
It's unwise to use their model because, like world of warcraft, it only really works once or for one incumbent.
Fortnite works because "it's fortnite", it's already successful as hell, any monetisation, even small amounts is enough to catapult it to profitability.
Time will see if I'm right or not, the industry is changing, large studios need more money if they're to continue making AAA games and it's clear that people begrudge spending $60 for a game and then having monetisation inside. I hope EA's gamble with Apex works, not to prove me wrong but because I think it's a good game.
Fortnite on the other hand.. I just don't get, the combat/controls/graphics/hitboxes/animations are kinda dirt. But I think it's popular because it's popular, like Paris Hilton.