So much work for so many people to update so many old websites that will see absolutely zero benefit from serving content via ssl.
I have an old travel blogging site with a few hundred thousand posts in read only mode. Thinking about how much work it was to upgrade my other sites to https, chase down and work around every http request in the code base, purchase and install certs for silly things like cloudfront that you wouldn't think would suck away two days of your life.
I'll probably just let the site die in July. It doesn't make money, so it's going to be a tough decision whether to dump thousands of dollars of otherwise billable time into upgrading it to accommodate google's silly whim.