I bought the Xbox One X for PUBG. I tried to justify it by telling myself I was also receiving a 4k blu-ray player. While I waiting for it to release since I preordered the Scorpio edition, I ended up ordering Halo MCC, Halo 5, Ark Survival, ESO (again...have on PS4), Forza 7, and Nascar Heat 2.
Once it released I have added to my library several of the free games with gold, and purchased Elite Dangerous at a special price.
So far it's still PUBG that I'm playing, and now with all the BC I'm enjoying the decision of my purchase even more. I own the physical copies of Jade Empire and Morrowind on the original Xbox, and most of my Xbox 360 games are playable on the One.
Moral of my story...even though I have bought a console for just one game, I end up with a bunch more. The beast that is my "backlog", only continues to eat and grow larger.