Perhaps because of this, future games will be more influenced by FFXI and everything that made it good.
I think it would take serious passion and talent to manage to extract what's generally good about FFXI and adapt it to what people want nowadays.
See it that way: maybe you have a younger sibling (in their teens) who look up to you as their inspiration/hero. They listen to your music, watch the movies you watched and so on, but would they play FFXI?
FFXI already had troubles reaching the majority of people back then, I think it'd be even more difficult nowadays.
I get trainees who are typically 13/14yo at work, they come to my desk at lunch to play games sometimes and when they see FFXI, very few seem interested. And of the few that may be interested, once they see the kind of investment you have to put into that game, they quickly ask me to switch back to Fifa or Street Fighter.
They rather take a beating than discover FFXI, the message is pretty clear to me.
As much as streamers can make people play certain games (Osu, Dungeon Fighters etc.), the games have to follow a certain trend, first. I'd even doubt that kids would want to play WoW, and WoW is immensely more popular when it comes to "fast food gaming" (gaming without much investment).