Given time Qualcom will design and perfect a 64bit ARM style CPU
You say this as if it's a law of nature. Projects fail in the real world, and there's no guarantee that the newer iteration will be better or "better enough."
Then again, it doesn't really matter that much because Samsung's bread and butter is low cost phones that are "free" with a contract. The kinds of buyers who are using them, by and large, don't really care about quality.