Exactly how Title says. This is for what people think Lifetime will be now. We change our predictions all the time so lets see how they turn out later on...

BotW and MK8D do not include WiiU sku so keep in mind...

As of end of June (2018)

SMO: 11.17mil

MK8D: 10.35mil

BotW: 9.32mil (Switch only)

Splat2: 6.76mil

Mine Lifetime as of now

SMO: 21.5mil

MK8D: 25.5mil

BotW: 19mil (Switch only)

Splat2: 13.5mil

Super Mario Odyssey: 20.5m
Mario Kart 8DX: 25.0m
The Legend of Zelda: Breath of the Wild: 16.5m
Splatoon 2: 11.0m

Mk8d:24 million
Mario Odyssey 20.7 million
Botw: 17 million
Splatoon: 11.8 million

This is assuming that Mario Kart 9 doesn't happen on the switch, that Odyssey two doesn't happen, that the next 3d zelda isn't until 2022, and that none of these titles get thrown in to a permanent bundle. I think all of the numbers I provided has a chance of being too long. It depends how more evergreen titles impact these four( Animal crossing, smash, etc). 

I guess mine is a little it more conservative lol:

SMO: 16.5mil
MK8D: 17mil
BotW: 13.5mil
Splat2: 9.5mil

Assuming we will get Odyssey 2, new Zelda and Mario Kart 9

Odyssey - 17.2m
BotW - 14.3m
MK8D - 18.6m
Splatoon 2 - 11.5m

Odyssey 2 will probably sell better than 1. Zelda could very well also sell more.
Mario Kart 9 will sell more and I don’t think we will get Splatoon 3, especially if they just decide to keep giving us expansions even though they’ve stated updates will end at the end of this year.

SMO: 20.5mil

MK8D: 26.2mil

BotW: 17.42mil (Switch only)


Splat2: 12.1mil

Your predictions are ok/fair aside from the MK one. Its at 10.35mil and its still at the top of the charts in almost all regions. There is a better chance of it hitting 17mil by years end then lifetime :p

MK8D: 23 mil
SMO: 22 mil
BotW: 18 mil
Splatoon2: 13 mil

Yeah that's definitely conservative, BotW and Splatoon 2 easily can be around those number at end of this year. :)