WA would have been much better off if they had slowly released it, gathered feedback and built up knowledge repositories.

Why can't you get http://www.wolframalpha.com/input/?i=how+many+college+gradua....

But you can get it for each university with http://www.wolframalpha.com/input/?i=harvard+graduates

Seems like it'd be a simple aggregate...

Little things like this would be flushed out with a bit of testing over time. The hardest part for WA is going to be figuring out how people want to talk to it, and that will take time.