The UO emulator scene got me into network programming. I've never seen an online game capture so many ancillary/emergent/accidental gameplay mechanics as well as this, somehow all the 3d MMOs seemed to downgrade a lot of the interesting economics, building, exploring that UO delivered. PvP and quest type stuff is probably a lot better in other games but it was still compelling and you could realistically play solo or in a group or casually interact with randoms and effortlessly switch between these as you felt like it.

Maybe there is some opportunity there? Very little going on in the mmo world now tbh. Wow, old school runescape, final fantasy online, not much else worth it.