With trend appearing to be that all software sales for the Switch get a boost every time the Switch gets restocked or a hardware boost, I don't think it's too farfetched for Breath of the Wild to go back above 60k for Splatoon 2 week.
Hardware Comparison Threads:
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Is Hardware Getting TOO Powerful?
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PlayStation/Xbox/Switch: 2022 Edition
PlayStation/Xbox/Switch Hardware Battle: 2021 Edition!
PlayStation 4/Xbox One/Nintendo Switch: 2019 vs. 2020
PlayStation 4/Xbox One/Nintendo Switch: 2018 vs. 2019
PlayStation 4/Xbox One/Nintendo Switch: 2017 vs. 2018
PlayStation 4: 2015 vs. 2016 vs. 2017