I'd say the second half of 2019. Switch isn't going to make 20m this fiscal year, but hardware sales will accelerate in 2019 and beyond. The XB1, on the other hand, will only decline in sales going forward. If I am off then it will be early 2019 instead of late 2019, but I am still leaning toward 2nd half of 2019.
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