I will just say that as a programmer IMHO 4e would be far far harder to implement than earlier editions. it has vastly more rules that are relevant to and have precise definitions that must be implemented exactly as they are in the RPG. 1e was very easy to implement in software, the rules were so mushy you could do basically anything and get away with it. If the classes, items, and spells basically did something resembling what they did in the PnP game, then it was OK. 4e would be 10x or 100x more work to implement. For the game development companies it is just not worth being able to slap the name 'D&D' on it, a name that has lost a lot of its currency outside a small group of active players and is in any case unlikely to be better recognized today than the bigger computer game franchises. It may be true (and I only grant this for the sake of argument) that some segment of D&Ders will only like D&D-based CRPGs, but those people make up a tiny fragment of the computer gaming community, and many D&D players are in reality perfectly happy to play games that don't happen to be D&D clones. I wouldn't MIND a D&D clone CRPG, but I think a 4e one at least is HIGHLY unlikely.