That you've seen a couple kids play niche, low population MMOs doesn't change the reality of what 97% of kids are playing now. There is a reason that things like Runescape and early wow were culturally massive and now the bar for MMO success is simply not going under. Kids do not give a shit about MMORPGs. They are playing Valorant, Apex and Fortnite, Minecraft and Roblox, Genshin, fotm things like Fall Guys and Among Us, even LoL is still more popular with kids despite how old the MOBA genre is also getting.
I grew up in a generation that had strong investment in MMORPGs. Where everyone was playing runescape during breaks and even people not normally into video games were playing pseduo MMO shit like Coke Music and Habbo. I have a 12 year old niece, I see what she plays, and what her friends (across two countries) are also into, we talk about games. You can see with even a casual glance what youtubers and streamers are popular with young demographics.
All of MMORPGs are niche in 2023. It is a niche genre. When new MMOs are successful, their success isn't from all sorts of kids who have never played an MMO jumping in and discovering the genre for the first time; their success is from cannibalizing decades-old MMO players from other existing MMOs. There is a reason that most new MMOs base their whole sales pitch on "it's like X old MMORPGs back in the day, remember?"
It's a genre that has been downtrending for a decade, with an archaic core design philosophy. Kids do not want a years long character progression journey based on leveling individual skills, pressing buttons to cast a spell at a boss, and doing written out quests to kill 12 wolves and collect haunted pinecones. They don't want a spell book with a bunch of tooltips they have to read through and decide when to use what. They want drop in, drop out, fast and fun, typically match based MP games where story (if there is one) is accessory.
Of course there are exceptions. I played Starsiege: Tribes when I was a kid; No one else I knew, even the other "gamer" kids, knew what the fuck that was or had ever heard of it. But exceptions are exceptions, and youth as a whole have very little interest in MMORPGs as a genre.
Yeah, I also think that is what we will get. Which is why I hate the idea of a revamp expansion. Because making textures nicer looking isn't enough to make helping the same NPCs fight the same enemy groups in mostly the same zones (for the third time in a 20 year progression) not sound like absolute torture.