Microsoft enters agreement to bring Call of Duty to Nintendo

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Native ports shouldn't be a problem on the successor unless it's incredibly underpowered even by portable standards.
The Wii got ports of Modern Warfare 1 and 3, Black Ops, and World at War from PS3/360, and that's a bigger power gap than exists between Switch and PS4/XBO.
COD will need to run on the Series S, so it shouldn't be a big jump from there to the next Switch.