I think DVD drives are becomming more and more popular. Sure there are a lot of people out there without them still. The games would be released on CD and DVD with the option to purchase either (or both for the obsessed). If more companies did it, more people would buy DVD drives. Then DVD could become the standard.
You're right! DVD should be the standard. For the sake of 20 odd quid everyone should have one. And may I point out, that's a about £10 cheaper than a full priced game <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />