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Yes, in the same way as all Pascal apps had to be rewritten to the C API a long time ago, and all Mac OS 9 apps had to be rewritten as cocoa (NextStep), or all
by grey-area 7y ago
Yes, in the same way as all Pascal apps had to be rewritten to the C API a long time ago, and all Mac OS 9 apps had to be rewritten as cocoa (NextStep), or all Objective-C apps will have to be rewritten as Swift as that is the new blessed SDK. In practice it won't be a huge burden as older apps will not be phased out for a long time - see the Objective-C to Swift transition - there will be a very long transition period.
I'm not saying this is great for developers, I'm saying it makes economic sense for Apple and the signs are they are moving in this direction.