In brief
iOS 11 was expected to drop 32-bit app support, potentially making around 187,000 apps and games unusable. As reported in March 2017, Apple was expected to announce the change at WWDC 2017 in early June.
In the recently released iOS 10.3 Beta, Apple added a pop-up warning to notify users that certain apps are 32-bit and are not supported by their iOS version. Overseas media reports suggest that Apple will formally announce at WWDC 2017, to be held in early June this year, that iOS 11 will drop support for 32-bit applications. For users of iPhone、iPad and iPod touch, this means that many apps and games will no longer be usable.
Analytics firm Sensor Tower says that around 8% of apps and games in the iOS ecosystem have yet to be updated and are incompatible with 64-bit systems, amounting to approximately 187,000 titles. These apps are considered highly likely to be forcibly removed by Apple after iOS 11 launches. Although Apple places great importance on the number of apps in the App Store, it is also willing to take decisive action: around 47,000 apps that had not been updated for a long time were removed in the third quarter of last year.
Apple's support for 64-bit computing on iOS began with the iPhone 5s, announced in September 2013, which was the first smartphone to use a 64-bit processor. In 2015, Apple began strongly encouraging app developers to adopt 64-bit technology. Nearly two years have passed since then, providing a substantial transition period.
https://unwire.hk/2017/03/16/180k-app-obsolete-after-ios11/software/ios-app/