So I got a copy of Fourth Edition D&D in the mail from Amazon yesterday. (Sorry, Jerry, I know it's stuff like that that's making you close up shop. I'll come buy some stuff soon.) It's...different. I can't tell yet if I'm going to like playing it or not. It's going to be ridiculously easy for someone, anyone, to convert that to a computer game. A character generator, monster generator, hell even a class generator - all those would be so simple to code up it's absurd.
I don't think WotC has put the license up (GSL) for this just yet, but I strongly suspect it will ban software implementations of the game.