I doubt much consumer content will be delivered in anything more significant than 4:2:0 anyway. I doubt any consumer-level programming is going to be delivered in anything but highly compressed MPEG for a very long time.
As far as disappointment goes - the 900A series will do 4k on all 4 HDMI inputs, and complies with HDCP 2.2 on HDMI input 4. So it is future-ready, as much as anything in the 2014 is ever going to be.
If you haven't got the input 4 mod done on an early production X900A, you should do it soon. Mine was late production, so it had the new input board already.
Whatever 4k content you get in the future, from whoever's player, it will almost certainly require HDCP 2.2.