I would disagree, how many iOS Devs are there, how many quality apps, how many people using them, anyone with a iOS device. I don't know what your smoking but iOS isn't going anywhere and neither is ARM. Windows failed because they had no apps even the normal apps. No devs no apps= no customers.
You're right but no way is x86 going away. Anything on x86 being used today doesn't work on ARM so an A20X Maxx chip could be superior in a technical point of view but still doesn't mean much when most stuff people need to use windows for like video games ( call of duty and etc) and other stuff which ios doesn't do.