I assure you there are places that do not follow the Agudah but care if Agudah rabbonim consider a person to be non-Orthodox and a non-Torah Jews. They will say Hallel on Yom HaAtzmut, march in the Israel Day Parade, shake hands with women, have only a small mechitza, etc. But if one candidate rabbi is recognized as being Orthodox even by the Agudah rabbonim while the other candidate is considered to be non-Orthodox by a large portion of Orthodoxy, that will be the dealbreaker for some such synagogues.
Lav davka, there will still be some synagogues that still hire OO. But some even left-wing synagogues will now not consider an OO candidate.