Let's invent the hypothetical scenario where this software creates flawless client and server code. You still need a company to do the billing and account management,
huge upfront cash for bandwidth and servers, customer support (unless you like losing money),
Oh yeah. And then you need the game content!
At least 2 writers, 4 modellers, 4 texture artists, a minimum of 1 "sound guy", a musician who doesn't suck, play testers, level/zone designers, an itemization strategy, ways of dealing with normal MMO problems (MUDflation, hacks, cheats, exploits), at least 2 public relations people, in-game GMs, online account management, 3 web developers (1 for content, 1 for web apps, 1 for layout and design), ... and so on.
But sure, once you've got a 30 man team working together for about a year, the flawless client and server code will come in real handy!