This thing was never going to fly. Sega is a shell of the company it once was. There core business now is licensing out their IPs for Sammy-made Pachinko machines and whoring Sonic out in bizarre and crappy games that nobody wants.
In light of how many companies are trying and failing in the hardware market (Ouya, Steam Machine, Chameleon, etc.) there is no way Sega was going to officially do this.
People cling to Sega and the Dreamcast like Elvis fans. The Dreamcast and Sega as we knew them are gone and buried.