It'll be fine. The Switch has done amazing numbers, and so long as the games are there and Nintendo doesn't have some catastrophic flub with the marketing like they did with the Wii U (which is unlikely as the Switch 2 is almost certainly going to be a much more straightforward next-gen Switch), the Switch 2 should continue that momentum. There was radio silence from Nintendo leading up to the Switch's announcement, which came in a trailer in October 2016, less than five months before the system released.
Assuming the Switch 2 comes out this coming March, they'll probably have a similar mid-fall window for announcing the Switch 2 and building up interest in the system. By the end of this year or early next year we should have a generally good idea of what game it'll have in its launch window, what the games will look like on the beefier hardware, what tweaks and bells & whistles it'll have compared to its predecessor (it'll probably have a couple of things to set it apart besides superior specs, even if it's simple improvements to the basics). Nintendo found a winning formula with the Switch, and I think they'll keep doing what's worked for them these past few years.
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