I maintain about 8 or 9 websites. All of them are HTTP only. I do not notice any drop in the number of visitors or losing position in Google searches. For example, I have a personal website. If I type in my full name, my personal site is #2 in the search results in Google even though it's an HTTP site. If I type in a book title that one of the organizations is selling on the HTTP site, it is #3 in the Google search. (They're also selling the books on Amazon, and the first two search results point to Amazon.) One of the websites gets about 500-1000 visitors per month. It is #2 on Google search. Their FB page is #1. So, I don't believe the hype. Yes, they put pressure on HTTP sites trying to get them to convert to HTTPS, but not all sites should have to convert.