Make individual blogs only visible for logged in users 

Blogs in my community are public, and I know there is a setting for users to make them private and only allow users on a list to see them.

But some users would like to have a blog that is not public for guests and search engines, but for all users who have logged in. 

Can you please add such a setting in a future release? Blogs are an important part of my community, there are more than 1000 of them. 

Thanks,
Markus