The fact that cheap Mediatek SoCs already support the format means that widespread HEVC support will only take a few years. The BCM2835 on a Raspberry Pi is ridiculously slow by today's standards, yet its AVC support makes it a decent media center. (for less than 5W, anyway)
Piggybacking on HEVC adoption is quite clever since hardware manufacturers don't care about still images, but there's no way to implement efficient HEVC support on mobile SoCs without dedicated hardware.