Apple mostly likely remove the keychain feature for now due to the large number of people who are scared of the NSA obtaining fingerprint data from Touch ID. Once the initial panic subsides and paranoia is calmed it will most likely be offered.
That has nothing to do with it. I wish people were more concerned with such things but most aren't. It's only because Mavericks is not out yet.
----------
I thought this with fingerprint access would be the killer feature of iOS 7. I'm frankly baffled that they didn't make a bigger deal out of this.
Why do you assume they aren't?