Etto NES already exist in japan as famicom, so even if Nintendo got Cold feet and not bother, maybe even sega would try and maybe be sucesful for a while.
People overestimate what happened in 1983 'crash'(was more a bubble like dot com), that hapepened that too much consoles and little hardware and cosnole were pretty weak to run pc ports(when NES handled maniac mansion, did 5200 or intellvision would have run it?)
Gaming would leave in pc, maybe Nintendo would try better with SNES later, as the tech was more madurted or maybe sega fill the american niche as they being kicked in the balls so bad in japan?