It was the Council of Nicea that settled the issue of Arianism. I don't see the Church departing from this teaching, hence my demurral. 
        Having said that, I thought it relevant that the way the Trinity is imagined might be different were the Orthodox view included, without the Double Procession implied in the Filioque. 
        The inspired writers and mystics I mentioned earlier were examples of THE CHURCH in the spiritual sense, which should include Protestant divines as well including Martin Luther King, quoted by Pope Francis in Amoris Laetitia.
       The idea that the Church has got God wrong needs a nuanced understanding lest we forget the many who didn't. However, we do need to grow and all Christians could use to improve their serve, to use a cliche. I welcome anything that challenges our complacency. 
         The book should be a good read. I wonder if the implications therein may be missed by many.