It’s already happened if you want to watch 4k HDR content you need a device capable of displaying it.

A normal 1080p HD screen can not downscale this you need to be able to take and handle the signal. thus the transmitter and reciever need to be of 4K HDR standard for which there are already different types of HDR.

It’s like trying to put a HD signal on an old CRT monitor. It won’t work because it is a different standard.

Because these things have different standards because they can do different things what older standards could not. A new product range is created and a set of standards are developed hut there was a lot of complication of 4K and what would be coupled with that on the extra pins of HDMI 2.0 or DVI. HDR won over HFR and HDMI with 2.0 ethernet probably also wins over HDMI 2.0 with return audio. The new standard means you have to buy the product range for the next best thing. I did not really care for having 4k screen or HDR it was like i got that for nothing because i simply wanted a larger screen. But I have it and the hope is from screen manufacturers perspective that i will buy into 4k HDR standard.

If you have a product to sell and It does not fit any particular old standard but a new one must be created for it. A association will help with Law, due dilligence and contracts and so on. They probably had very little to do with deciding HDMI 2.0 would carry HDR though on the spare pins.

You want to sell your product and hunt for big contracts you pay for the access via an association. The product itself could be made in China, Japan or South Korea. The sssociation will help meet standards, client access and when contract is one they tske another cut with the expert lawyers.

Obviously domestic stands and medical standards will be very different also as will military standards. Police and fire service would have slightly lower standards than medical or military but still above domestic.