When it says that 'non-Google accounts and profiles will be removed' does that mean my blog will be deleted - since I use a non GMail based Blogger account?There are two bits of confusion here.
I've explained a few times that a Blogger account, GMail based or not, is still a Google account. That detail does not change. Next, we should recall how Blogger provided login to the Followers gadget, for those surfing the web without using a Google account.
I observed, years ago, that logging in to Blogger / Google, and to Followers, were different and separate processes.
Right now, potential Followers see possibilities, that few know how to use, when logging in to Follow a blog.
Twitter, Yahoo - we know those services. What about AIM, Netlog, or OpenID?
Originally, Blogger Followers was part of an assortment of different community building services. You could use a non Blogger / Google account to login to the Followers gadget, and to identify your other followed blogs and websites. And, you could use your Blogger account to login to non Google community services, on other websites.
If you had two or more Blogger accounts, you could even use one to access the Blogger dashboard (and your Reading List) - and use another to login to the Followers gadget. This would cause confusion with the "My blogs" and "Reading List" content - and other problems.
So now, Blogger is simplifying the Followers gadget - hopefully to use Google "One account" login. Maybe, Blogger can eventually provide Google multi account login.
In the mean time, we are advised that
you may see a decrease in your blog follower count.And we note that some of us have already seen a decrease.