Right now the Switch's biggest draw is with 2 groups:
1) People who want a very powerful handheld.
2) People who want Zelda.
After this Christmas, everyone dying for Zelda will have their chance at the Switch, so sales will be down somewhat in 2018. Then in 2019 the Switch will get new groups of people.
3) The normal handheld crowd (i.e. 3DS crowd) waiting for a cheaper/simpler version.
4) Home console gamers just looking for a console with a big library.
5) Lapsed Wii gamers who want to come back for a console better than the Wii U.
In 2019+, the Switch is going to blow away 2017 sales charts.
curl-6 bet me that PS5 + X|S sales would reach 56m before year end 2023 and he was right.
My Bet With curl-6
My Threads:
Master Thread, Game of the Year/Decade
Switch Will Be #1 All Time
Zelda Will Outsell Mario (Achieved)
How Much Will MH Rise sell?
My Bet With Metallox