What do you guys think Nintendo would be doing right now in 2020 if the Switch failed?
IMO if the Switch failed I think Nintendo would continue supporting the 3DS since it was still selling well even when the Switch released and down the line around 2019 I think Nintendo would've launched a direct successor to the 3DS to stay afloat through the dedicated handheld business.
As for the Switch, I think it would've been another rough time to be a Switch owner similiar to the Wii U where Nintendo stops giving a shit about the Switch due to low sales and we'll barely get games outside of Wii u ports and unambitious filler games, and knowing Nintendo, they probably would try to sweep the Switch under the rug as fast as possible and maybe release a new dedicated console in 2021, or maybe just give up in the console market entirely and focus on the 3DS & its sucessor.
Many people expect Nintendo to go 3rd party if the Switch failed, however I don't really believe this because Nintendo has a ton of money and they could afford to fuck up their consoles several times. Also, knowing Nintendo's strict philosophies I don't think they'd ever want or consider becoming 3rd party since they believe they need their hardware to create innovative experiences with their games that the other console makers can't offer.