Personally, I would like to see more magic apps, but not the ones that are currently available. Of course I agree with the idea of apps such as iDoodle being about to replace pen and paper when you're asked to do an on the fly effect. However, a lot of the current apps are simply transplanted tricks that, for me, don't use the phone to its full advantage.
Is doing a force that you could easily do with a deck of cards but now have on your phone more convenient? Yes. More magical? Definitely not. I don't want to sound like an Apple fangirl, but the hardware on both iPhone and iPad is pretty impressive: is there nothing we can do with these devices that turns the phone itself into a magic object? Telling an audience member you feel there is something wrong with your device, taking a picture, and it turns out to be a spirit photograph? Not a "psychic friend" on the end of the line, but the phone itself giving the answers? (can you tell I like bizarre stuff

I am not opposed to using apps, but I feel that the ideas can be taken much further than they currently are.