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Same. It's already tough finding a cable with enough length to go from from my floor-standing PC through my cable-managed standing desk and monitor arm.

There will probably be long (and expensive) fiber optic cables eventually, but yeah the basic copper cables are likely to have very limited reach.

They already exist. I recently bought a 33 foot fiber DP1.4+USB3.1/2 (depending on how much video bandwidth you’re using) cable on Amazon for about $130.

I meant they'll eventually exist for HDMI 2.2, the current ones probably won't support the new higher bandwidth modes.

(For the people that don't measure the world in limbs: that is ~10 meters.)

If you need long runs, place a pair of SDI media converters in between. Spec is IIRC 100m for coax cable runs, longer if you run fiber.