Wow- very interesting comment from Google’s John Mueller (Sr. Webmaster Trends Analyst) this morning around HTTPS that flies in the face of everything I’ve heard over the past year. Responding to someone on Twitter who stated that “Without an HTTPS certificate, Google is likely to drop your website in search results.” John replied "Yeah, that’s wrong." “HTTPS is not a factor in deciding whether or not to index a page, at all,” he added.
He did explain that Google does “use HTTPS as a light-weight ranking factor, and having HTTPS is great for users.”
That said, all of my sites are HTTPS - and I certainly wouldn’t put up any new ones that aren’t…but, he says loud and clear that your sites do not need to be HTTPS to be indexed and ranked by Google.