I wouldn't expect Gen 8 until 2020, 2019 earliest. But I gotta say, 10 million lifetime?... Why so low? Mainline Pokemon games usually sell 15 million minimim. If Gen 8 sold 10 million lifetime on Switch, Nintendo would consider that a huge disappointment.
Hardware Comparison Threads:
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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