Yeah, besides the fact that the headlamps control module would likely need to be replaced as well (I imagine ours is not compatible considering the signature LEDs of the 2014+ models are on constantly) and the whole thing would likely get incredibly expensive even if feasible, the 2014s also seem to lack the halogen "fill-in" bulbs that fire up on HID equipped 2010-13s, along with the bi-xenons, when you select the high beams.
I am sure the 2014s are every bit as good, and those always-on LEDs do look sharp and modern, but I have never driven a vehicle with headlights as good as my 2013 before, so if it ain't broke... I also don't much care for the front LEDs of 2014+ temporarily shutting off on either side when you engage the turn signal. All new Land Rovers do that, I understand the reason behind it (makes the blinker more visible to oncoming traffic) but looks kinda funny and "wrong" to me. I think it would look less weird if both sides shut down when the turn signals are operating.