I'd say the Atari 2600. It proved there was a huge market for game consoles (in the US). Regardless of the NES, sooner or later, someone would come along with a console, because you don't just ignore a huge market like that. The Atari managed to sell 8 million units in a single year, which was pretty huge back then. Even though it crashed, someone would rise from the ashes, even if it wasn't Nintendo.








