Great article, interesting mix of informative description and pessimism.
On the perceived defined audience, knowing what I do about the device (having closely followed most news since January) I would submit that its all of the above. There are features across the board that would fit well as the go-to gadget for both business and personal use.
Killer app - we have no idea what Palm has in play for initial release, but news from the development front is overwhelmingly positive, so this is a non-issue. As the phone reaches the market, developers will reach the platform.
Lacking a killer platform argument is at best adolescent, at worst screams of competing platform fanboyism. From design to OS, this is a groundbreaking platform.
Finally, to label multitasking and Synergy as "fleeting" is a true indication that you need to study the device and the OS a bit more before you pen your next article.