There is an inherent friction in using any Software or a Gadget. A piece of technology or service that removes/reduces this friction is going to win BIG!
Some successful examples:
1. DropBox
2. Swipely
3. Kayak
4. Instapaper
5. GPS Voice navigation
6. Multi-touch interfaces
....
I believe Siri belongs to same the class of technologies..
iDisk offered essentially what Dropbox offers. iDisk sucked, Dropbox doesn’t.
I’m not saying the execution is great (I simply cannot know that at this point in time), I’m saying that execution is extremely important when it comes to whether something is game changing or not.
Some successful examples:
1. DropBox
2. Swipely
3. Kayak
4. Instapaper
5. GPS Voice navigation
6. Multi-touch interfaces
....
I believe Siri belongs to same the class of technologies..
HCI has still not reached 1.0