Siri will redirect people to a more natural interaction with web searches, thus ending the reign of "type in some magic words and you'll get what you're looking for, hopefully."
Sounds a lot like the old command line interfaces, doesn't it? Sure, if you know how to use the text entry field and all the tricks like Boolean search queries, etc. you can find whatever you want.
But wouldn't it be cooler to say "where can I find saffron?" when on vacation and just have your phone show you where to go?
one man's journey into creating gibblybits