What if Sega go back to their video game console roots?

Since the beginning, ruled in the video game industry, Sega has been rivaled Nintendo with couple of their consoles, until following the failure and discontinuation of Dreamcast, Sega step down from producing anymore console in the market and currently focus as a third-party to other major video game studios. So the AU scenario question is, what Sega would step back in the console marketing to compete Nintendo once again? And what console would Sega can do while Nintendon’t? We’ll see.