If they want to make the iPad a laptop killer, they first need to make it more like Asus's Transformer, with a keyboard dock, and second, they need to get more apps on iOS that can replace people's need for Windows apps.
Not only does Apple actually make a keyboard dock: http://store.apple.com/us/product/MC533LL/B?fnode=MTc0MjU4Nj... but the iPad can also connect to a Bluetooth keyboard, which I've actually used in the past.
"and second, they need to get more apps on iOS that can replace people's need for Windows apps."
They've obviously released some with the iWork suite. There's also simple text editors (and more sophisticated ones, but I'm not a fan). I can easily see the iPad as a laptop killer for some.
These already exist from Zagg and Logitech.
>they need to get more apps on iOS that can replace people's need for Windows apps
This takes time. Hardware and software will progress to allow this.