alt Hacker NewsI think Hangul worked because it was adopted at a time of mass increases in literacy. All those poor people who never wrote before didn't have any attachment to Chinese characters, and soon significantly outnumbered any monks, nobles, bureaucrats and merchants that were attached to them.
Imagine all the paperwork that would have to be rewritten now. The older generations who won't be able to learn the new system. Just commerce, with millions of small businesses, would be a nightmare to transition. Sounds like a lot of work for not much gain.