First just want to say a BIG THANKS for AP, best $20.00 I have ever spent. I have been working in Photoshop since 1995 and while a great program, when Lightroom (2.0) made it's debut in 2008, I was hooked, mainly due to it's non-destructive design. However as Adobe has not made a real effort to support iOS, I am very much hoping that Serif is looking at a similar full featured program for iOS on the heels of AP. You do this, you have a customer for life.
Oh it is inevitable that the iPad or some other tablet will replace the Laptop and even the desktop in very short order, it will happen. Technological advancements move at lightning speeds and while today's tablets may not have the brute muscle of their Laptop/Desktop cousins at the moment that does not mean that it will remain that way, give it another 2-5 years and we will see who is right. I am definitely with Cook on this and his earlier assessments that the days of the Laptops are numbered.