Maybe a few people who just gotta have the newest, latest, and greatest gadget will switch to a Flagship android because they can't wait for the new iPhone. But most people are pretty loyal / trapped into their mobile ecosystem.
I doubt it would materially affect Apple's market share or their revenue long-term. Isn't the entire manufacturing cost of an iPhone $9? Even if it doubled, their profit on iPhones would only drop by like 5%...
I think their latest pricing experiments have shown that there really is a limit to how much people will pay for a new iPhone, and they've found it, so I don't think they could pass the price onto the consumer. But it's only $10 on a $900 phone...