Assuming we buy the processor horsepower argument, the only other problem I could foresee is that Siri pretty much depends on data connectivity, which means it'

Assuming we buy the processor horsepower argument, the only other problem I could foresee is that Siri pretty much depends on data connectivity, which means it's only really viable on 3G iPads. Your use case is very limited (although a really cool idea, and you've got me thinking I need to do this.), but if you can come up with a clever way to educate users about it not working w/o data, then I agree that it should also be available on iPad 2.