0 A.D. Goes Open Source
DoubleRing writes "Wildfire Games has announced that it will be moving its previously closed development process for 0 A.D. to open source. All code will be released under the GPL and all art under CC-BY-SA. 0 A.D. is a historically-based RTS, and while it's not yet complete, this trailer is purportedly actual gameplay footage. With a codebase of over 150k lines of C++ code plus 25k lines in development tools, this is looking like a fairly promising entrant into the open source RTS field. The screenshots are definitely pretty, to say the least."
That's a bit of an understatement. Most people would probably agree that Nethack looks a lot better than Freeciv.
Coders with enough time and skills will look at the code. If they will find things that can be improved they'll improve them, if they find things that can improve other games they will port them. Open sourcing stuff is like allowing people to communicate, before we have each person and his/her own idea, after we have each one evaluating others perspectives. That's how human knowledge progresses.