HEVC is scarcely "done".
It's in production and working extremely well in UHD BluRay, UHD linear TV, and 4K OTT streaming services. It's also enabling great consumer experiences like HDR.
Even if AV1 was done today, there'd be years of runway for broad availability of hardware decoders, and performant, well tuned encoders.
I think we'll all be living with HEVC for several years, at least!
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