There were very few complaints when the original Xbox One was announced, and it failed to do 4K. In 2013 nobody really cared about HD's successor. Not unless they'd spent thousands of dollars on one of the few 4K TV sets available at the time. Yes, the best consoles have a habit of being future-proof (see the PS2 playing DVDs and the PS3 playing Blu-ray), but in 2013, 4K seemed too far in the future for anyone to care.