Multiplayer is less of a priority in games than it is today. Local multiplayer will continue to exist, of course.
Games will be more complete when they release, due to the lack of patches, and DLC won't exist. Physical copies will be just about the only way to play games.
Basically a lot of gaming will be how it used to be, but continue to evolve with better graphics and sound, etc.
Lifetime Sales Predictions
Switch: 125 million (was 73, then 96, then 113 million)
PS5: 105 million Xbox Series S/X: 60 million
PS4: 122 mil (was 100 then 130 million) Xbox One: 50 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