I was thinking that they'd be forced to adopt this, as 3rd. party cookies goes away, but somehow I sense it's more likely that advertisers would adopt something like device fingerprinting instead.
The online shopping businesses really isn't interested in privacy, I don't even really blame the adtech industry for this one. The companies running the ads and retargetting campaigns want to know who clicked on what and when. Anything less will trigger a frantic search for ways to evade privacy improvements.