So, Nintendo Is The Only Gaming Company that Can Survive With No Third Party Support? If Not Who Else? (If each Company Had Their Own HW i mean)

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Sony would struggle and playstation would most likely go under, they use their games as loss leaders mostly. Microsoft would leave the business, probably keep Halo/Gears and make them PC games.

EA could survive by themselves, imagine a console that was the only place you could get all the sports games. It would sell a lot IMO.