Based on sale, Nintendo can pack themselves on the back for coming out of 2020 dominating out of the big 3.
Switch 2 or Pro (which ever is the ones that will refresh the current hardwares) will likely come out during a time where the big PS5 and Xbox title will arrive, So alongside software, the hardware is going to have to be something good to keep up.
We've heard tidbit on what they may be doing to make sure of that (4k, OLED display, dock only console etc)
But what could Nintendo, being Nintendo..... do to screw this up?
Going Cardless? emphasis on Cloud gaming?
What could go wrong?
I would argue it is already gone wrong - and I say this as someone that loves Nintendo's games, and have a Wii(for cube), WiiU and Switch plugged in to use in our house. The WiiU's early problems weren't so much a lack of confidence in Nintendo producing new great TV games, eventually, and I would argue that the best first party games to appear on Switch are all WiiU ports at a design level that helped in the Switch get a better reception than the WiiU.
IMHO the Switch's main success has been to ride the tail of the Miyamoto-san era of software development and to appeal to a 3DS audience with a non-switchable Switch model that offered a large catalogue of games with the vast majority being digital only indie, or old console emu/ports/remaster offerings.
I believe the Switch is no longer a home console, but a hand held that has a version that can dock and provide a WiiU hardware level experience on a TV. A Switchable Pro model can neither keep pace with current last gen consoles (PS4/X1) and remain portable, so a Pro is actually either got to be a home console, or a Lite Pro, but not both - and even if DLSS could fake that, the first party software offering is world's away from the N64/Cube's high point of Miyamoto/iwata-san, etcs home console game output and the third party AA/AAA game support.
My assessment is that the Switch has been a major financial success for Nintendo, but at the cost of them leaving the home console market, and if a Switch Pro doesn't follow the handheld success of the Switch lite then the barren home console game offering by Nintendo's current teams will be a repeat of the WiiU following the Wii/3DS - only that every meaningful remaster has been used already on previous systems, and now they won't even have that option to fill a sparse release schedule.