With the growth of RPG type games and increased character interaction in the virtual world, I think that a universal gaming token could take off. There are already games, such as WoW, that utilize an economy and exchange for buying and selling of goods within the games themselves. So, in theory you could create a crypto that could be distributed and used universally...although I have a hard time believing that different platforms, and games would agree to use the same currency.
But as you mention, if it is tied to a game that takes off (I think of the Oasis from Ready Player One) then why not just use existing currencies that are already established. The market is already flooded with altcoins so it is probably best to wait it out to see which tokens take hold.
I'm also fairly new to the crypto world, so I could just be rambling...
Part of the fun of crypto. Your opinion is as valid as someone who's been doing this for years. The relative ease with which people can create a new token, and the potential upside, makes it more likely that everyone will launch competing tokens. Calling the next big game is harder than calling the next big crypto. But crypto in the Lightning Network arena are good candidates for universal adoption, I'd say.
Digibyte (which is actually a decent token, spec-wise) is used on private Minecraft servers, I think. But that was a drop in the bucket.
If it was easy, we'd all be rich already. ; ) Games on the blockchain are becoming a thing, too...
It's a lot to process.