Virtual Worlds! Is there a hope to join the blockchain hype with their own currencies?

I m thinking about virtual worlds and their digital currencies like lindendollar in secondlife. I wonder why they do not join the blockchain technology. But perhaps this can happens in future. Think about it. How this will change virtual worlds? I think this will help to make opensim worlds and other virtual worlds more interesting.

When you are a member of virtual worlds, you can contact them and ask why not. Perhaps this can help to make virtual worlds more popular.

Think about : A connection between virtual worlds and cryptocurrencies on the blockchain technology !