How much do you think Pokemon Let's Go will sell first week, by the end of 2018, and lifetime?

My Predictions, 

FW: 3.5 million

2018: 9 million

Lifetime: 14 milliom

So Sun/Moon did 3.7M and USun/UMoon did 2.1M ,I think it'll be somewhere in between, probably slightly towards the upper end, I'm going to say 3.1M FW

Lifetime is really tricky I think Let's GO will have its legs cut off hard by the next Pokémon game and will also have a lower install base, I think it'll still sell 12M units in the long run

I can see it doing 2 million to 3 million mark.

2-2.5 million First week, 15 million lifetime

I'd say 14 million - in just its first year.

Lifetime 25 million.

Remember: Pokemon Red/Blue sold over 30 million. Yellow over 14 million. Overall, it's still the most widely known and popular Pokemon game. Let's Go is clearly a remake of that game and will heavily emphasize that fact when marketed.

They're also piggybacking on a worldwide phenomenon in Pokemon GO - which will be tracking near 1 billion downloads by the time Let's Go arrives on Switch.

While us forum dwellers easily set poor, modest or even somewhat healthy expectations on Let's Go - the truth is that it's deliberately made to appeal to a massive mainstream audience. 

Mark my words, the week it launches - it'll pour jet fuel all over Switch sales.

The Pokeball plus - even though it's a gimmick - will likely end up as one of Nintendo's best selling gimmicks ever. Fistfights among parents, millenials, and random older Pokemon Go players will breakout on Black Friday to get the Pokeball plus. News broadcasters, parents, and priests will attempt to report negatively on the new Pokemon game - only to later be sucked into it.

I think it'll be fun game - and such a big hit that no one will sit on the fence about it regardless of the review scores.

This will also be the game that also likely push many families to start buying more than 1 switch unit - with Smash Bros likely furthering that rationale.

i will go with 3 million

Past games.

Pokemon Black/White - 5,563,251
Pokemon Sun/Moon - 5,188,415
Pokemon X/Y - 4,188,339
Pokemon Diamond/Pearl - 3,435,277
Pokemon Omega Ruby/Alpha Sapphire - 3,422,762
Pokemon HeartGold/SoulSilver - 2,988,985
Pokemon Black 2/White 2 - 2,653,177
Pokemon Ultra Sun/Ultra Moon - 2,138,150
Pokemon Platinum - 1,966,988

FW: 2.8 Mio
2018: 7.5 Mio
LT: 10.5 Mio

10m lifetime, less than the standard Pokémon RPG. It could easily go the other way though, difficult to predict if it will actually see creed in capturing a new audience for Pokémon games or not. I'm not convinced people who played a free to play game on a device they already owned will shell out $60 for a game, plus $300 as they likely don't own a switch.

I 100% agree with you haha