How does blockchain help with this? The problem isn't that there isn't a record of your purchase on a ledger somewhere, the problem is that the software environment in which your purchase is meaningful is no longer running.
> Interoperability of digital items: when people talk about this, they usually talk about being able to use a gun from one game and bring it into another game. I think that's suuuuupeerrr far off, if a good idea ever at all.
Your "much more straightforward idea" can be summarized as "use them to make money".