I think VR and classic gaming will continue to coexist in the future.
Virtual Reality will be the standard way of playing first-person experiences of any kind, in about 5-10 years any AAA developer will make first-person games ONLY in VR, games like Call of Duty, GTA, Doom, Half-Life, Fortnite (any Battle-Royal in general) and also first-person RPGs, Survival Horrors (Resident Evil etc) and Racing games (Forza, Gran Turismo etc). VR is simply the best way of playing these type of games, it's the natural evolution of 3d gaming, as they require full immersion of the player in a 3d environment.
Of course, VR technology needs to improve and become cheaper for the mass market (PSVR2).
Classic gaming on consoles, PCs and mobile will still be available for everyone who like to play classic genres like side-scrollers (platforms, 2d shooters), classic beat'em up, strategy games, puzzle games and third-person games in general (2d or 3d).
As for streaming, it may (or may not) become the standard tech to deliver games to classic consoles or VR headsets.. in the end, it's just a way to receive a game on a device.