We're in the middle of a full-frame resurgence, thanks to cameras like Sony's line of A7 cameras, the Pentax K-1, and even Nikon's affordable D610. It's easier than ever to get into a full-frame system, whatever brand you prefer, for around $2K.
It's easy to see that with Micro Four Thirds on one side, full frame on the other, APS-C might seem like it's less and less exciting to camera buffs.