Probably would've overloaded the servers since they were having server problems before even just with the iPhone. The only reason Siri is still in Beta is so they can test it with the masses and collect enough data to perfect it and then take it out of Beta.
I think Siri will be out of beta for iOS 6, I know for a fact there will be some additions and enhancements on iCloud.
Siri: “I love you guys, but it’s hard for me to get emotional. Because my emotions haven’t been coded yet.”
“Has anyone been using the new Samsung? Not the Galaxy, the refrigerator.”
“Hey, anyone been working with Ice Cream Sandwich or Jellybean? Who’s making up these names, Ben and Jerry?