To this day, I run into people all the time that say, whether it was 'Doom', or maybe even more so 'Quake' later on, that that openness and that ability to get into the guts of things was what got them into the industry or into technology.
With ZeniMax, they have a lot to be proud of. 'Fallout 3' is one of the favorite games of so many of our people. But they had zero overlap with the things we do. We do the best shooters in the world. It's a perfect hand and glove fit. We started talking about this before they rolled out 'Fallout 3'. We watch them roll it out worldwide.
Developing games for the PC and consoles is all about everything and the kitchen sink. In many ways, you don't have design decisions to make. You do it all. So I enjoy going back to making decisions about what's important as I'm working on a game.
The important point is that the cost of adding a feature isn't just the time it takes to code it. The cost also includes the addition of an obstacle to future expansion. Sure, any given feature list can be implemented, given enough coding time. But in addition to coming out late, you will usually wind up with a codebase that is so fragile that new ideas that should be dead-simple wind up taking longer and longer to work into the tangled existing web. The trick is to pick the features that don't fight each other.
Sharing the code just seems like The Right Thing to Do, it costs us rather little, but it benefits a lot of people in sometimes very significant ways. There are many university research projects, proof of concept publisher demos, and new platform test beds that have leveraged the code. Free software that people value adds wealth to the world.
The situation is so much better for programmers today - a cheap used PC, a linux CD, and an internet account, and you have all the tools necessary to work your way to any level of programming skill you want to shoot for.
Nvidia's OpenGL drivers are my 'gold standard', and it has been quite a while since I have had to report a problem to them, and even their brand new extensions work as documented the first time I try them. When I have a problem on an Nvidia, I assume that it is my fault. With anyone else's drivers, I assume it is their fault.
We are working internally on a completely new project, but we haven't made any firm plans yet for the future of the Wolf, Doom and Quake franchises. I would enjoy doing a DS or PSP game, but at this point I can't imagine having the time to be seriously involved in it.
Some cynical people think that every activity must revolve around the mighty dollar, and that anyone saying otherwise is just attempting to delude the public. I will probably never be able to convice them that that isn't always the case, but I do have the satisfaction of knowing that I live in a less dingy world than they do.