I expect a "new Switch" in 2021 or 2022. The old game settings for docked mode will probably transfer to the undocked settings of the new device and they will add a "new docked mode". Three presets for all Switch games should be manageable:
less demanding games: 720p on old Switch undocked, 1080p on old Switch docked and new Switch undocked, 1440p+ on new Switch docked
more demanding games: ~540p on old Switch undocked, ~720p on old Switch docked and new Switch undocked, 1080p on new Switch docked









