I don't think it'll be that simple. There will be plenty of people who hold on to ICEs for no good reason but habit. When prompted they will say head-scratching

I don't think it'll be that simple. There will be plenty of people who hold on to ICEs for no good reason but habit. When prompted they will say head-scratching things like 'I like the way it sounds' or 'it's safer from hacking' or 'God put dead algae in the ground billions of years ago for a reason'.