I guess some kind of cross chain something or other might end up being developed.
Cross-chain tech is already a thing, I wrote about it one or two weeks ago, you even have an alliance of the biggest cross -chain blockchain trying to further improve the interoperability of all different chain, I'm so excited for the future.
If you happen to want to read more about the cross-chain tech here: 1, it's not really detailed but it has the basic stuff and what it might be used for in the future.
I think developers will have to start learning about basic economy for each game they make to prevent pyramid schemes from happening.
Yeah, of course cross chain things exist. But trading digital goods across chains...that's a bit different.