Mobile doesn't need killer apps. Mobile itself is the killer app.
That's why 3/4th of all mobiles sold are still dumbphones. Of all the smartphones sold, a good fraction might be used as dumbphones. And those that are used as smartphones, you're lucky if you have more than five apps being used constantly.
Mobiles are not built on apps but on services. What are services? Voice, SMS. Examples of other services, email, GMail, GPS location and maps, BBM, IM (GTalk, Live, AIM, QQ...), social networking (Facebook, Twitter, Plurk, MySpace...) Nlow we have more like cloud backup, mobile banking, mobile payments, NFC, VOIP, video calls.
A mobile happens because of these qualities that makes up its own killer app. Gruber, Gizmodo, think mobiles are small computers, and by thinking they are miniature PCs, must require apps to make them viable. A PC is an empty machine that has no purpose or function unless it has an app. A mobile is a small computer, but it is also beyond a small computer. A mobile has unique qualities of its own that separates them from PDAs, PMPs, game consoles, tablets and handheld PCs. A mobile is simply way beyond a handheld PC.
1. It can call.
2. It can text, message or email with notification.
3. It can fit into a pocket.
4. It is an extension and an expression of the owner.
5. It is ever present. Or the owner needs it to be ever present.
6. It can locate
7. It must notify.
8. It can capture context (photograph, record video, tweet, microblog, etc,.
9. It is always connected to a network.
10. It must always be powered on.