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Getting a big team and lots of cash.
An mmorpg isn't a one-man job, at least not to get an actually polished game.
I found a short, decent article of what goes into an mmo dev. team:
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If you have 100% dedication and use pre-made assets, you could probably code something that is playable and fun, by yourself, but I wouldn't expect it to be a big hit. (If you want, you are free to prove me wrong)
You'd need to learn about networking, coding and security as a bare minimum.