Electric cars require literally tens of thousands of more electricity to run than tablets.
Quad-core, 2GB RAM, 64GB storage, USB 3.0, 1920*1080... and 24-hour battery usage, what's so special about any of the wish list that makes it "not going to happy anytime soon"? For a quad-core tablet processor to last 24 hours would require at least twice as much battery power as the one provided by the third-generation iPad, but switching from 45nm manufacturing process to 22nm would make that relatively easy. So far, most CPU and GPU units have been manufactured using 45nm processes. Part of the reason is Intel is not yet into the CPU market for phones and tablets. LG Electronics has been selling smartphones equipped with 2GB RAM for some months. 1920*1080 isn't impossible and there are samples of 2560*1600 resolution just 6-inch form factor screen. 802.11n has been ubiquitous at least since the first-generation Galaxy smartphones and Broadcom and some others have sampled 802.11ac modules. 64GB embedded ONE-NAND modules aren't difficult or expensive to ship either and soon will come 256GB and 512GB for phones and tablets.
What really is important is most PC manufacturers and software developers have hardly invested in tablets. Apple first released iPad in 2010, but it was mostly for messaging, not word processing. It's now Apple's third-generation selling the most, but it's still mostly for messaging and eBook reading and Microsoft will only slowly be releasing Office for iPad, and not with the full features available in desktop / PC versions. It's not because tablet is a disabling form factor. It's because it takes time to prepare and evolve the various hardware and software components. Apple wanted better hardware components for their first-generation iPad, but the display and SSD parts to make iPad optimized for reading and web browsing were not available for mass production then. Keyboard's another matter. Keyboards and other types of input will also rapidly evolve in various forms. Rather than tablets continuing to have limited market share due to limited input capability, desktops and laptops will more and more imitate current tablets by adopting touch and Wi-Fi/LTE.
Android is yet a toy only compared to Windows 7/8 and Mac OS X Mountain Lion, but Apple is trying to make OS X as close to iOS and iOS as close to Mac OS as possible and Google'll try to keep ahead of the hardware component industry to make Android a little more powerful in each major version release.
In short, tablets WILL replace a very large part of what servers and destkops and laptops are now.