Well I have to disagree with you on this one ED. As of today:
Iannetta: .209 AVG/.727 OPS
Conger: .260 AVG/.746 OPS
This is, of course, a small sample size and both have BABIP issues (Iannetta bad, Conger good). Beyond that though Hank has shown in the minors that he can hit for average, ability to get on base, and has some pop in his bat. Iannetta probably has a better eye but the differences aren't quite as wide as some would think.
I think Conger still needs to prove that his defense is improving (and he has made some blunders this year too) but if he makes those improvements he is not just a back up catcher, he belongs in our starting spot moving forward.