Regarding "Dockable Tablet iMac":
WARNING: The premise of this post is that the next iMac will recieve better hardware, which may not be the case!
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I would say that my major complaint about the iMac is that it's barely a step above a MB/MBP. Aside from the price advantage and bigger screen, there's no advantage to it (and I can think of a few disadvantages... no ambient light sensor, no back-lit keyboards, not portable). Point is, if I'm going to get a computer with those hardware specs, I'm going to get a MBP.
Apple needs a desktop between the portables and the Pro and since they've shown no interest in a "mini tower," the iMac has to be it. In my opinion, the current iMac's specs don't cut it. In order to beef up the iMac, however, Apple will have to use better parts: 3.5" HDD (please!), faster processors (C2D extreme family, please!), more RAM, etc., but all this requires better cooling, heavier parts. If this device we made into a convertable tablet, it would be an utter beast to carry around. This is not to mention that it'll have to contain a massive battery pack. All around, it'll be like carrying around a large wooden cutting board.......... but heavier. It will not work.
The only way I forsee this convertable tablet iMac is if the specs are so weak that it is less powerful than a MacBook so that it consumes less juice. I mean, you're going to want to be able to use this thing for a few hours, and you're not going to want to be lugging around a heavy brick of a computer, am I right? Apple will not release a tablet that is any less portable than those found on
Star Trek: TNG (and later)... y'know, the half-inch thick rectangle with a screen. For this reason, it will have to be much less powerful and much lighter than a current MB. And if this is the case, it will not be a suitable replacement for the iMac.
I do think that Apple will eventually produce a computer like this, but it will not be an iMac. It, like the iPhone, will be crippled (in the right ways) to allow it to do tasks capable of being performed on a truly portable, lightweight device. However, like I said, it will not be an iMac.
Here's hoping the new iMac will not sacrifice too much power for style.
-Clive