So let’s assume for a moment that Apple is really going to to a Tablet. Why should they me modelling it on the iPhone, and not the Mac? If it’s going to be with a 10″ or 12″ display and have at least a halfway decent processor, I think the natural choice would be to go with the Mac as the starting point; the ModBook shows the possibility of such a venture. There’s loads of software available for the Mac as a platform as opposed to — probably none that would be running without modification in the App Store today. So if they want the plattform to take off quickly, I guess it would be in their interest to have the ready-to-run software available right away.
If Apple were indeed to offer an App Store for the tablet, it more certainly the not needs to be just one distribution channel for the plattform, not the only feasible way for developers to get software onto the devices.
But maybe Apple will again surprise us with an entirely new take on the topic. They’ve done that before.