There are a lot of websites saying to treat crown rot by cleaning off all the rot and pouring straight Hydrogen Peroxide down the middle. I tried it on a Phal I really liked and figured what the heck. The roots still looked good and I can always compost it later. Amazingly enough, It bloomed!
I thought about cutting off the flower stock but... one last chance to enjoy a plant I really liked. It took another year but, one day, little leaves. This year, resplendent in new leaves, its going to bloom. It was a long wait but worth it.