As a console gamer, I can't see myself not owning all three consoles.
I'd be missing out on Super Mario Odyssey, Metroid and Pokemon on the Switch (amongst others).
I'd be missing out on Spider-Man, God of War and The Last of Us 2 on the PS4 Pro (amongst others).
I'd be missing out on Sea of Thieves, Ori 2 and Forza Horizon 4 on the Xbox One X (amongst others).
But that's just because all platforms cater to my tastes.
Edit: I can fully understand why some would choose to have one or two consoles because of the lack of time/money, or a PC that replaces the Xbox.
I'd be missing out on Super Mario Odyssey, Metroid and Pokemon on the Switch (amongst others).
I'd be missing out on Spider-Man, God of War and The Last of Us 2 on the PS4 Pro (amongst others).
I'd be missing out on Sea of Thieves, Ori 2 and Forza Horizon 4 on the Xbox One X (amongst others).
But that's just because all platforms cater to my tastes.
Edit: I can fully understand why some would choose to have one or two consoles because of the lack of time/money, or a PC that replaces the Xbox.