I fear the challenge will be one of perception. Speech is really a make-or-break first impression kind of technology, since speech is so personal. I'm afraid that Siri will need to become twice as better as the competition to regain the trust of users that it won't completely fail them, or even to just get them to retry it.

I wonder if, in the future, there will be some sort of marketing push called "Siri 2.0" or maybe even regular "releases" (even though I'm sure it's not updated on that kind of cadence). Since the technology is all invisible, there's no way to tell that something has changed, unlike a traditional OS, which changes its appearance even slightly.