Just take this form factor, and blow it up to 7" and 10". Especially the aluminum unibody, BoomSound speakers and 1080p display.
I'd have picked up the View, except it was heavier than the Galaxy Tab, and a ton more expensive than the Fire. Now my daily e-reader is the Nexus 7 best of both worlds, light and inexpensive.
If HTC were to do it now, I wouldn't want an all aluminium chassis actually, that's far too heavy. At that size if you want to go with premium materials, you have to switch to Carbon Fiber, or maybe a Magnesium Alloy. Seriously at 7 inches or bigger, weight becomes a MUCH more serious issue than material feel.