You could script...:p
You forgot dedicated really. I know a bunch of guys who attempted to write MMO games, some of them in Flash actually, but after half a year of work, that's 6+ hours a day, you've got a field, few basic textures and a unit that can move from left to right.
Unlike OpenSource programms, which take a while to write, games require entire crews of directors, animators, designers, programmers, etc to be successful. Look at the production values of popular games alone. Creating a game isn't reallty something you do over a weekend, or two, or three...