I was thinking the same thing. If they don't it might be time to replace my Airport Extreme. I love it and it works flawlessly, but if they don't provide updates it's worse than not having WiFi at all.
macOS and iOS computers have been issued patches to mitigate the issue on vulnerable networks.
Source: https://m.imore.com/krack-wpa2-wi-fi-exploit-already-fixed-i...