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I don't see the loss of a physical keyboard as equaling a "loss of usability." Since a tablet can have a virtual keyboard, and users can adapt to using a virtual keyboard as easily as they adapted to the physical keyboard, I see them as equal... if anything, the tablet becomes more versatile because the keyboard can be "removed" when not needed, and even replaced with more specific controls to the task.
I realize many people have a hard time getting used to virtual keyboards. But that doesn't make physical keyboards inherently "better," just more widely accepted at this time. Remember, just a few decades ago, no one could imagine using the physical keyboards we have now, as everyone was typing on upright Royals and such, and saying "you need the tactile feedback of good typewriter keys to be able to type properly." And even a decade ago, most people would have locked you up if you had told them a significant portion of the population would be sending e-mails on a Blackberry today.
You get used to what you want to get used to.
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