I am under the belief that cartridges lost out to CD/DVD media due mainly to manufacturing cost and storage concerns. With that in mind, I am wondering what would keep a video game system from using cartridge format for its games? I recently saw 8GB USB flash sticks for around $10 so it would be reasonable to assume that video games selling for approximately $50 new would be profitable using flash memory storage. The storage would even be slightly more than is currently available on a DVD disc. What is the roadblock to this becoming a reality?