Well, if I only had an Xbox One, I certainly would look at the 30+ PS4 exclusives which are supposed to come out this year with a bit of envy. Still, even if that isn't the case with you or any other Xbox One owner, my point still stands. As a matter of fact it's only being reafirmed: Contrary to popular internet wisdom, the people who buy every system under the sun are a tiny minority.
I don't have a clue of what the numbers are outside the US but the number of households in the US that own a console has hovered around 50% for years and the average number of consoles per gaming household has hovered around 2, which makes sense especially considering when the number of consoles sold into the US during a gen is roughly equivalent to the total number of households in the US. Multiple console ownership in the US has been quite common.