I do believe that the iPad Pro could herald in a new era. Computing power is well on it’s way to match that of laptops, with a “lighter” OS that is hard-wired to the hardware. Retina 12″ screen, touch. Coupled with a good controller this could very well be the replacement of the laptop. I could do without the keyboard (hook up a mini BT keyboard and be done with it if you really need one) and it would bring the screen so much closer that the difference in distance might just make up for the smaller screen (15″ MBP now). The touch feature would make it far more feasible to use “software” FX as they can be operated easier than with mouse/keyboard.
All in all I am a definite believer in the iPad Pro as a possible laptop successor in the DJ Booth, but I’d have to agree that software only solutions are still in the “fun for an impromptu party” department.
Having said that, DJ Player on an iPad Pro and a good midi controller of your choice? That is some killer setup imho.