So... I had this idea. I have a YouTube channel and I did a video on how to get Nether Quartz from older Nethers. (In case you're interested, here's the link: https://www.youtube.com/watch?v=CXmj-H4yQ50) I realized that this only works in the Nether because most people build in the Overworld. Say someone had a pre 1.3 world and didn't have any Emerald. (For example purposes) I was thinking maybe a mod that regenerates the ores in the world. This is called "RetroGen". Thaumcraft has a config for it for all of it's ores! Something like that, except for vanilla ores!
What do you think? Also, is it possible?