I don't know, I think people are putting more expectations on today's catchers than they probably deserve. Sure, Realmuto is a good catcher and a clear upgrade, but he's one of about a half dozen catchers league-wide you could say that about. If you don't have or can't get one of them, I'm not going to stress out over the position.
I mean aside from the Yankees, the other AL playoff contenders are rolling with likes of Martin Maldonado, Yan Gomes, Brian McCann, Christian Vazquez, Russell Martin, Mike Zunino and Jon Lucroy. Unless the year is 2014, I don't see anyone there that's significantly better than replacement level. It's just a black hole of a position these days, most of the time the best hitters are moved from catcher long before they reach the majors.
Having an injured catcher these days evokes sympathy from me for the injured player, but an "Eh" in terms of impacting the team.