Apple stop selling iphones won't take the iphones away, not many people care about their next one. The impact would be negligible and every other country would notice they can demand compliance.

> You think the population of Japan will be ok with banning iPhones

Why wouldn't they? Japan has no codified Apple-specific lock-in. Their citizens won't miss a criminally illegal iPhone any more than they demand to import the gold Escobar phone, Huawei handsets or the FBI's ANOM. It would be effortless from a legislation perspective and harm Apple far more than it harms Japanese people.

Japan isn't part of FIVE-EYES, their government doesn't rely on Apple for surveillance purposes. There's no real potential for political blowback unless America's politicians take it personally. Japanese citizens would just buy different phones, no different from what China has already done (without any pushback). If America demands that they give Apple market access, they can embargo the iPhone under security pretenses instead.