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Resolution will be based on Nintendo Investor Relations data.
https://www.nintendo.co.jp/ir/en/finance/hard_soft/index.html
As of the March 31st, 2023 update to their numbers, the Switch has sold 125.62 million units so far.
The current best-selling videogame console of all time at the time of market creation is the Playstation 2. The last official sales number from Sony with regards to the Platstation 2 is 155 million units, so this will be the number to beat, unless Sony updates this to a higher number at some point. (https://sonyinteractive.com/en/our-company/business-data-sales/)
If Nintendo report that the Switch has sold more than 155 million units at any point before 2026, this market will resolve YES. If they don't, NO.
A Switch 2 is heavily rumoured for 2024. Not sure the current switch will sell 30m in the next two years if a successor is already on the market. For comparison PS4 sales have decreased massively since the release of the PS5 in 2020: https://sonyinteractive.com/en/our-company/business-data-sales/