I'm sure the vast majority of apps this affects are mostly rotting away with broken functionality. Worse still, there are many apps that could definitely benefit from newer APIs. There's no doubt that this new ruling is going to have some edge cases where old, but perfectly functional, apps are lost - but there is a grace period that developers of these older apps can work in to update them and keep them listed.
This is a good compromise - Apple issues a store-wide ultimatum to developers and any that are still interested in keeping their apps listed will update them. Those that aren't will need to do nothing. If any of your apps disappear, it stands to reason the developer has abandoned it.
If the developers don't want to do basic updates every few years, I'm not sure Apple should bother giving them special magic URLs for the 2 new people each year who might want it.
I don't think apps should be removed for having non-retina assets, or not supporting 4.7" or 5.5" displays. But if the app truly doesn't work anymore, and hasn't for a while, then I would consider that being abandoned. Even then, Apple will be working with devs to try and get the issues sorted
>"We are implementing an ongoing process of evaluating apps for these issues, notifying their developers, and removing problematic and abandoned apps from the App Store. " (from the email sent to developers)
[0]https://web.archive.org/web/20140923001007/https://itunes.ap...
There are a large number of apps which just don't work. They crash, depend on web applications that don't exist anymore or they've been questionable from the very beginning.
Apple can and should clean up apps that don't fall into a grey area without creating an inconvenience for users like you.