Carmack also noted that he is looking forward to some day seeing somebody ship a commercial title, probably a budget game, under the GPL. He'd like, for example, someone use the Quake III source to complete their own shooter and ship it with the full source code included on the CD. Carmack expressed frustration with people who get overly protective about code that is largely built on the work of someone else.
I'll make a game. It'll be the coolest eva.
Trust me, John C!