Speculation is that iOS 11 will require 64-bit apps and that all of those 32-bit apps that were never updated will be removed from the store.

Wouldn't that also mean that 32-bit iPhones and iPads would not get upgrades to iOS 11?

Apple could kill almost 200,000 apps with iOS 11 - Mashable
https://apple.news/AV1rVqGz8TgKR2lrrlbY3ag
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