Zzzz. It's gonna happen, get over it. That being said, its a free market, you can, absolutely offer hand crafted assets for a premium, in the same way you can go to a bespoke store and get a tailored dress or suit made for you. But most people are content with mass produced goods that make things accessible.
In this case I am completely fine getting MORE games that put pressure on companies to step up their games instead of having an oligopoly. But that's only going to happen when MMOs don't cost absurd amounts of money to make and maintain. I'm sure plenty of communities would be dying to have the power to make their own interesting games and AI will enable them to do so. I'm not for gate keeping that capability just so people have to rely on billionaires that can pump out the money to have everything hand made.
Look I'm sure some farmers that used donkeys and shovels didn't welcome the tractor at first. But today, we can produce so much more food because things became mechanized and mass produced. And yes a lot less people are needed to tend huge fields, but it brought the cost down and has led us to have a decent amount of food stocked in our groceries at all times. It's just the way things are.
Like this:
Current situation, god knows how many people actually work on a dungeon right? Lets say 10 for simplicity. - These 10 people start with a linear corridor, add a couple of trash pulls, design the bosses, make the mechanics and need to be done in one month to make the boss happy. It takes a lot of work because the team runs lean but it gets done.
AI situation:
You prompt an AI to design you a large dungeon in a deciduous forest setting with 10 differing paths and unique geographic features such as explorable lakes with fully underwater exploration available and buildings along with generic but interactive wildlife, for example, maybe the dungeon has some deer that will make an emote if you /feed them. Something no human would bother coding from scratch but a nice detail. And now that team of 10 people can focus solely on designing the enemies and bosses with unique and interesting mechanics.
TBH this isn't even a new thing, I remember the scenario builder in Age of Empires 2 could seed you a map with wildly different terrains and strategic maps that were full of fish, wildlife and well... everything you can think of. And that game came out decades ago.
I know which dungeon I'd rather run, idk about you.