The 7800 was re-released to jump on the NES bandwaggon.
Something released due to the NES can't really be given credit for re-igniting the US console industry IMO. This thing came out literally because Nintendo had shown the market to be viable again and Atari wanted a share of the re-immerging market.
Most Atari 2600 sales were during the early to mid 80s, before the NES came out. Sure it carried on selling well through the late 80s as a budget machine but it did not compete on a level with the NES.
Sega of America were tiny during this period, and couldn't market or distribute the Master System properly, most of the 2 million SMS sales happened after Sega had given up, when Tonka Toys had taken over sales of the machine from 1988 onwards.
Fact is, as history went, the NES re-started the US console market single-handedly, simple as.
Now thats not the same as saying it "saved the industry" as I personally think that it was only a matter of time before the US regained interest in consoles (the rest of the world was healthy and doing their own things, afterall), if it hadn't been NES, it would've been Master System, or one of the 4th gen systems IMO.
The NES was also damaging for the US market in some ways, their practices were anti-competitive, and the way they forced companies to buy huge bulk amounts of cartridges (for double price) would've made it difficult for new US start-up companies to get their foot in the door.
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