Thank you! It sounds like we're talking about apps that: people have already paid for, have installed, are using, but haven't been updated / downloaded in 3 years...Removing it from the App Store doesn’t mean it’s removed from people who have bought/obtained the app. People will almost certainly be able to peruse their previously obtained apps and still get it.
It seems like everyone who uses those apps ARE using those apps, and they can continue to use them if they decide. But that might mean those users can't update to a new OS and expect those old apps to continue working if they're not updated. And if you choose not to update your OS and keep all the old, outdated apps you want, then so be it. But to want it both ways - expecting outdated apps to not only continue to be stagnant on the store, get no or few downloads, and are not properly supporting the latest devices/OS - is kind of absurd.
Keep your apps, don't remove them from your device, don't update your device... everything you want should work. If you want some new feature of the OS, but don't want that new OS to break your old apps, then petition the developers of your favorite apps for updates, or don't update your device. Apple demands very little here.