This is literally going to be what they did for FLoC. Basically release it as topics.
Google absolutely cannot stop tracking everyone at this point. I'm pretty sure they've put the entire house on the bet to track people more and do everything to ensure that Google Chrome tracks every aspect of your web browsing experience.
So while WEI is dead, I think Google's boat is so far out to sea now that it's either try this again a bit more gently or watch the ship sink. Everyone said FLoC was dead and they absolutely put it into the web browser with Topics. Nothing convinces me this is any different, they are absolutely going to, and I dare say have an existential need to, put this shit in everyone's browser.