This is inaccurate (and hyperbolic). My copy of Siri is working just fine, on my iPhone 4.
Here's the update that TechCrunch posted recently:
Update: After a brief downtime, the servers came back up.. with a message of their impending demise: “I’ve been replaced! The new Siri is even smarter and better looking than me, and waiting for you on the iPhone 4S. I’ll be leaving for home Oct 15th. Until then…how can I help you?”
I’ll be leaving for home Oct 15th. Until then…how can I help you?”
That is exactly how I read that which of course doesn't make sense given that they will be running servers for the new version :/