The biggest problem here is not that the green lock is being eliminated, but rather that HTTP pages will show a low-contrast grey message unless and until you type into an input.
By default, if you're not typing in a form, Chrome will show no major eye-catching colour-differentiation between HTTP and HTTPS. That's a major regression in user security.
By default, if you're not typing in a form, Chrome will show no major eye-catching colour-differentiation between HTTP and HTTPS. That's a major regression in user security.