Both will fail, DVDs have not been around for all that long and so many old timers are still using VHS.. People are getting raped up the ass with prices and new technology and I think they won't buy into either. Besides do we relaly need them? you can rip most DVDs onto Cds (excluding menus, extra) and let's face it most of us never use the extras.. Also in regards to games, most PC games are on CD format still, using 3 or more discs but they are not even using DVDs...
also, with compress technology as it is, there is no need for 47Gig