If you want to avoid sharing posts on Google+ the next time you publish a post, or you do not want to share posts automatically then you can just turn off this feature from the Google+ tab located in your blogger Dashboard.
How to Automatically Share your posts on Google+ in Blogger:The very first thing you need to do is to connect your Blogger account with your Google+ profile because without having a connection you will not be able to avail these features. On the right top corner of your Blogger dashboard, click the Wrench button and then select “Revert to Google+ Profile”. Once done, you will be able to see use the features offered by Google+ to its blogger users.
After the arrival of Google+, there were many rumors that Google might deprecated Blogger and claim to be the biggest social networking site. Instead, the company is trying its level best to pull these two giants together and closer.
In December 2013, Google+ mention system was brought to blogger. In July 2013, Google+ Prompt sharing arrived on Blogger. In April 2013, Google+ Comments were made available to Blogger. Now Blogger posts will show up automatically on Google Plus and the replies made to those posts that appear respectively in comments.
By such integrations this is for sure that Blogger is here for a long run. Now if Google+ starts disappearing from Blogger then you should know that what will happen. Yes, Blogger will be deprecated just like Google Reader.