Anti consumer practices probably won't keep you in business. Developers will eventually leave, then Apple will have to make every app everybody wants. Except, they won't bother, because everybody will be ditching Apple.
Eventually, there will be faster non iPhones. There is already a phone as fast as a 2016 iPhone 7. It'll have to be faster then that to get people to buy it. Unless they are using something slower then an iPhone 7.
Will they release a new iPhone SE? Just put a better CPU then my 7 in it, and sell it for the same price I paid for my 7 or less.