By the time HEVC becomes usable, computational requirements won't matter because processing power will be so much more in the future.
Exactly the same as when H.264 standards were introduced. Everyone complained it was so slow and required so much extra processing power (over MPEG-2, MPEG-4). And yet 8 years later we all thoroughly enjoy x264.
It honestly wasn't that long ago that all but a few extreme processors could process HD material in real-time with H.264.
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