You want to help people feel more secure? How about you downgrade every https website to Yellow color, unless it uses PFS (only with a few good cipher-suits) and the latest version of TLS. Requiring HSTS would probably be good, too. They should also be required to have 100 percent of the site under https, before getting the Green color. No mixed content.
Right now you (and other browsers, too) give the "safe" color Green to to the bare minimum of https security, even if it uses TLS 0.9.8 and RSA 1024-bit. Sites are not going to upgrade their security policies as long as you, the browser vendors, keep showing them to the users as "perfectly safe". There's no incentive in it. I think it's on browser vendors to push some of the incentives.
What percentage of big websites (say, top 100 sites and top 100 e-commerce sites) use HTTPS without PFS? If it's significant, then the yellow will just become meaningless.
Right now you (and other browsers, too) give the "safe" color Green to to the bare minimum of https security, even if it uses TLS 0.9.8 and RSA 1024-bit. Sites are not going to upgrade their security policies as long as you, the browser vendors, keep showing them to the users as "perfectly safe". There's no incentive in it. I think it's on browser vendors to push some of the incentives.