I already run Lightroom on a tablet - a real tablet. With Win7, Core i7, 16GB RAM, 256GB SSD and Wacom screen interface with pen, I can work on 30mp images in seconds in LR, without any stalling. Even on the 12.1" screen, LR has to have the panels folded down quite often, but it is nice since i can flip up and use a full keyboard. The Wacom stylus with pressures makes editing precise and quick. The screen is also touch, but using fingers is pointless - the sliders are too small. Then again, making the sliders bigger would just waste more screen real estate and make the user have to scroll more, just to reach the same amount of functions. Look up the Fujitsu T731/T732, I use it for field shooting architecture and a lot of product work on site...and 8-10 hours of battery life with LR in full throttle on the i7.
These consumer "tablets" should remain in the realm of what they were designed for - daily lightweight companions for reading news, being "social", and general activities.