So anyone with an iPhone 4, 3GS, 3G, original iPad, or original iPhone is just out of luck? There are still lots of apps that only need iOS 5, 4, 3 or even 2. Those old apps work just fine. If you remove old apps, then old devices will no longer have access to those apps.
DOOM Resurrection hasn't been updated in 6 years. It only requires iOS 2.2.1 to play. It still works fine.
https://itunes.apple.com/us/app/doom-resurrection/id318567158
The market share for those devices has got to be under 1% so it's not really a huge deal. You understand those smaller iPhones cause newer apps to suffer because we have to make sure our apps can fit on a 3.5 inch screen. How are we supposed to make an app optimized for a 5.5 inch screen when it's gotta be bavkwards compatible with the 3.5 inch. It's a real hassle I hope 9 was the last to support those devices so I no longer have to spend design and coding time on the <1% of the market.