Anglicanism flourished for centuries, with a balance of “high church” and “low church”. This allowed for plural forms, and some degree of choices for persons in most cities. There was variation in worship style - smells/bells or not - as well as different strains of thought, but all unified. Thus, a young adult might well differ from their parents, but still stay Anglican. That variety kept a mild tension going, but just enough so people would be challenged to different ideas, somewhat different worship styles, all within the Communion.
This balance depended on people in various roles - bishops, scholars, clergy, laity - all presupposing that Christian authority exists, and a sense of the supernatural. Both High and Low Church preserved these, as they discussed, sometimes argued, and lived out Scripture and Tradition. Thus, they could call to conversion.
The new “disagreement” the Archbishop is asking “space” for is different. He’s not saying Scripture and Tradition are different ways of following God, he’s saying we need to keep all those God-followers in, but make room for those who use the secular media as God’s new revelation, as well as those who want no supernatural god - just social goals, like equality. In other words, he wants the church to struggle to retain membership at all costs. The church would continue to foster traditional devotions, classic Anglican writings, incense, etc, as long as this helps retain the consumer base in certain markets. Let the historic small town parish continue in peace as if nothing out of the ordinary is going on in that other city. What is really division will be rebranded as a “strength”, or as “diversity”.
Lewis accurately predicted the secular attack on Christianity, but overestimated the ability of the Anglican balance to respond. He did call for an alliance between “High” and “Low” - to what he called “Deep Church”. (If he could write one more essay today, with the new data of the past 50 years, I bet I know where he would now identify as “Deep Church”).