Currently Online 
In mainstream games, split-screen for Xbox and PlayStation software has been slowly dying since the end of 360/PS3 era.
Nintendo has also been moving more away from them, but still has some on offer.
Split-screen is indeed no longer the standard. Even a lot of local multiplayer Nintendo games are games that aren't designed with splitscreen in mind (Super Smash Bros., Super Mario Bros. Wonder, etc.)
Split-screen will likely never fully die (some indies if nothing else will still use it), but is dying a slow death to obscurity.
Lifetime Sales Predictions
Switch: 161 million (was 73 million, then 96 million, then 113 million, then 125 million, then 144 million, then 151 million, then 156 million)
PS5: 115 million (was 105 million) Xbox Series S/X: 48 million (was 60 million, then 67 million, then 57 million)
PS4: 120 mil (was 100 then 130 million, then 122 million) Xbox One: 51 mil (was 50 then 55 mil)
3DS: 75.5 mil (was 73, then 77 million)
"Let go your earthly tether, enter the void, empty and become wind." - Guru Laghima
