Google authorship does not build your trust with readers. Most aren't even aware of it. And in most niches, nobody cares what your real name or credentials may be. If you provide good content, that's all they want.
I have found that Facebook pages and Twitter feeds are good ways to let readers tell you what they want from you and/or follow your site. But for the most part, this is hands off.
Except in one niche I've found, where it really pays off to engage personally with readers on Twitter and Facebook. They ask questions, you answer, and they think you're being wonderful and spread the word. But in most niches, readers don't even want you engaging with them and it's not rewarded.
Google authorship may do you some good WITH GOOGLE. But as we've seen time and again, anything that only helps you WITH GOOGLE and not with readers is eventually going to stop helping you.