Why doesn't Apple come up faster/better way to access Siri

Every time I tried to use Siri I get annoyed because

a) I have to press button for freaking 3seconds
b) And most of time it does not work because well home button is not working half the time...(hope they fixed this in iPhone 5)

I think if Apple is really serious about having Siri as the main feature for coming years, they should come up with better ways of accessing it(ie not 3seconds press) like something that is more short and quick.(may be make a dedicated button OR use volume button)