Im not a developer, im just writing thas as potential idea:
Fonline source code has been released last year allowing anyone to create custom versions of the engine
http://fonline2238.blogspot.com/For those unfamiliar, it is custom made sandbox MMO engine for Fallout1/2 that allows playing on one gigantic map that includes all cities and most places from both of these games. Game features very advanced crafting, mining, gathering resources, permanent Jet addiction (no cure! lol), clan wars and many more.
It would be amazing thing if somone managed to integrate in-game trade with bitcoin and relaunch the project.
Original version suffered some economical problems - everyone were hoarding cash like crazy, so getting your hands on in-game currency was awfully hard espacially for noob players. Getting your hands on advanced equipment was even harder.
The only RPG that currently allows for in-gmae bitcoin trade is rather unsuccesfull
https://www.bitfantasy.com/.
Bitcoin payment system is well suited for microtransactions nessesery in MMORPGs. Will anyone pick up the challenge?
For everyone curious the gameplay there is also fonline reloaded project (
http://www.fonline-reloaded.net/) that picked up maintaining servers after original creators resigned.