It does 95% of the things people usually do with their computer with 5% of the headaches. Shouldn't be a problem.

Not to mention 75M people already know exactly how to operate it.

Yes, but they already own an iphone. And they'll need to keep that iphone because apple, smart as they are made sure you can't make voice calls with this device.

So either they will have to convince those 75 million people to carry two devices or find a new market.

I intend to buy iPad. I don't intend to carry it much: I see it being used at home, comfortably on the couch.