As of Mar 31, 2018 Switch has sold 17.19m units total, which means they are doing fairly well right now. (I've updated the first post to reflect this.) Nintendo is projecting 20m units for the next fiscal year. I don't expect them to make this goal for their next fiscal year, but that is ok, since the Switch sales are going to come back with a vengeance in years 2019 and beyond.
Nothing to do now but just sit back and see how this generation unfolds.
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