The iphone, and subsequent phones, have/will bring decent film making and photo taking capabilities to average people. These people, likely, can't afford or were not interested in spending thousands on a DSLR or a pro video camera in the first place. Surely, some will switch one way or another but, these devices target different markets and, there is almost no overlap.
In any case, the main value of a DSLR is in the lenses first, and the body second. I can't use my glass with this phone, nor can I take advantage of all the in-body features that makes a DSLR a far superior photo tool. Must people just don't care about this, though. They post blury, noisy poorly focused pictures to their facebooks and are rather satisfied with them because the content of their photography is more important than all of the technical bits that makes great photography great.
Just a thought:
Considering the high price of DSLR cameras, why don't manufacturers offer cameras with options, in much the same way car companies offer cars with packages and extras? Perhaps, a company would design a model around the sensor, metering and AF capabilities alone. Customers would add tertiary features such as GPS, Wifi, weather sealing, etc after the fact to build exactly what they need. This way, those of us who want or need these features can have them, at extra cost, while those of us who do not, can leave them out.