Let's not forget that in the last year or so, a Chicago newpaper fired all the photog staff and issued iPhones to their reporters to get pictures with.
Do I agree with that move? Absolutely not!
It is however, a sign of the times. I've taken some really decent shots with my 5s, but I also know the physics of light and sensors on many different types of cameras, both still and video. The camera phone sensor, small as it may be, is benefitting in some ways just as full frame 35mm camera sensors are. Namely, increased light sensitivity. Whereas you can get practically noise free shots with hight end DSLRs in situations that would have required flash in decades past, you also get better shots with the lowly phone camera. In good light, you can get some nice iPhone shots, and if you frame it properly, can get some shallow depth of field.
So there are a few limited examples of iPhone and iPad being used in professional situations, but it's due to the photographer/videographer knowing the limitations and how to work around them to best advantage as any good artist does with their choice of medium.