Discounting "obsolete" (not Big 3 + Sega) companies, there are two candidates:
N64: If you don't like Nintendo games, there is just about no reason to own one. Even with Nintendo games, it misses so much in certain genres such as RPG's, SHMUPS, etc - the SNES is just so much better.
Xbox One: 6 years later, there are very few reasons I see why people buy one over a PS4. Game pass? Otherwise, the X360 got a lot more games, a lot more exclusives, and a lot more attention from its parent company giving it genuine life by the PS3.