That seems like a stretch. Even in Europe where people can choose to use different app stores, few people actually do. So few, in fact, that one of the alternative app stores recently shut down.
Have you considered that people just like Apple's products and services?
Hardware sales aren't picking up the slack, and advertisement revenue is also following a growth trend. Apple's stock would indeed be cooked if they went balls-out against the government that guarantees them access to cheap hardware and software that has been declared illegally anti competitive by foreign sovereigns. Apple needs this.
Have you considered that people just like Apple's products and services?