I've worked with banks, who are among the most security-minded of organizations. It's not because they're security nerds, it's because the cost of getting hacked is astronomical, and because regulations require them to be "as secure as possible."
Banks won't be chomping at the bit to implement WEI because they hate the open web or they hate Linux users. They'll be chomping at the bit because if they don't it will be a liability, and a "you're not doing all you can for security" type of risk that can open them to lawsuits, regulatory punishments, and even higher insurance costs. WEI is not a requirement right now because it doesn't exist. Once it exists though, you can be sure it will become a standard practice requirement, and anyone arguing against it might as well be arguing that using CC cameras is a privacy invasion: they'll seem absurd and won't last long in that position.
In short order it will be implemented by all the CDNs like Cloudflare, and it will be a simple checkbox for site owners to add to their site. Failure to implement this would be a fiduciary disaster, so they will have no choice. Once that is there, nobody who cares at all about security for their site (which is pretty much all people) are going to uncheck that box.