Dreher's story doesn't ring true. He says that he was scandalized by the clerical sex abuse scandal (who wasn't?) and, therefore, decided to try out an Orthodox parish. After being smitten with the solemnity and beauty of the Orthodox liturgy, he decided that the Catholic Church's teachings on papal primacy and papal infallibility must be wrong.
Dreher is clearly using his newfound "discovery" that the Orthodox are right about the papacy to justify his decision to leave the Catholic Church. He had to find some intellectual reason that would allow him to indulge the warm and fuzzy feelings he was getting by going to this Orthodox parish.
Dreher writes that if the doctrine of papal infallibility falls, then "it all falls." Hence, he is duty-bound to leave the Catholic Church. But why stop at Orthodoxy? After all, Orthodoxy shares many beliefs with the Catholic Church. But if the Catholic Church is wrong about papal infallibility, then couldn't it also be wrong about the Trinity, or the Resurrection, the sacraments, or any other doctrine that it holds in common with the Orthodox? Dreher is not being logical here. But, then again, his decision to leave the Catholic Church was not logical. Nor was it right.
For that reason I think it's true that the intellectual or doctrinal reasons for his conversion to Orthodoxy were sparse --- even he would admit that. But the fact that his conversion was "emotional" is not to be scoffed at. He was not just pursuing warm fuzzies; he was fleeing a horror and anger which was parlous for his soul.
I believe it is objectively wrong for a Catholic not to abide in the Catholic Church; but subjectively, he's doing what he sees as his duty to preserve faith (and hope and love) within his family. I pray for him, and frankly I am glad he is in an Orthodox parish where he and his loved ones can still be nourished by the Sacraments. May he (and we) receive a merciful judgment.