Looking at how much the software increased from last quarter, we have these numbers:
Super Mario Odyssey: 10.41 -> 11.17 million (+0.76 million) - Currently the 4th best selling 3D Mario game of all time behind Galaxy 1, 3D Land, and 64. If the upwards momentum is true for the software as well, then it should pass 64 (I'm not counting DS version to its total to anyone who was going to bring it up. I'm treating that as a separate game.) and maybe even the 12 million mark with the next update. Afterwards, it should slowly but surely catch 3D Land, and eventually, Galaxy 1, to become the #1 best selling 3D Mario game of all time.
Mario Kart 8 Deluxe: 9.22 -> 10.35 million (+1.13 million) Currently the 4th best selling Mario Kart all time behind Wii, DS, and 7. This is going to be one where we're in for the long haul. I think it will eventually pass 7 and maybe even reach DS. But, Wii is impossible to reach in my opinion. I don't think we'll ever see a Mario Kart game reach those kinds of numbers ever again.
Breath of the Wild: 8.48 -> 9.32 million (+0.84 million) It's' already the best selling Zelda game of all time by far, and it outlegged Mario Odyssey for the 2nd quarter in a row. The sky is the limit for this one. I think 15 million for just the Switch version alone is likely.
Splatoon 2: 6.02 -> 6.76 million (+0.74 million) I think 10 million is all but guaranteed. Let's see how far these kids & squids, Inklings and Octolings, can swim.
1-2 Switch: 2.29 -> 2.45 million (+0.16 million) 3 million, easily. Maybe by the end of this year. I also think it'll reach 4 million eventually, and may even have a shot at 5 million.
ARMS: 1.85 -> 2.01 million (+0.16 million) Another that should have no problem at 3 million. 4 million will be a little more tricky though.
Kirby Star Allies: 1.26 -> 1.89 million (+0.63 million) Should be within the top 10 best selling Kirby games by now. Yet another that should easily reach 3 million and claim the #2 spot in the Kirby series. After that, comes the big question. Will this game finally be the one? The one to top the original?
Xenoblade Chronicles 2: 1.31 -> 1.42 million (+0.11 million) - This one should get to 2 million without much difficulty. YES! Unfortunately, I don't think it'll go much higher than that, and 3 million is looking more out of reach. NO!
Hardware Comparison Threads:
Current Thread
Is Hardware Getting TOO Powerful?
Older Threads:
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