Well, it depends how well the Switch can transform into an post-PS5/Scarlett-era. Currently Switch can maintain the image, of producing games that lok similar enough to hme console experiences on the go. I doubt this image can be uphold after the release of PS5 and Scarlett. If Nintendo is able to transform the image to a handheld era like the 3DS, it can sustain good sales even then. If not, then soon after a new console from Nintendo will be released.