They'll likely never replace DSLR's, Point and Shoot cameras may be another story...
When cell phones have interchangeable lenses with fully adjustable apertures and high quality glass it might happen. Not holding my breath.
I agree that a phone is useful for doing lots of things like a Swiss army knife is but as the phone evolves so will the dslr.
Mobiles phones will play a major role, competing with compacts and more straight forward and connected. DSLRs will be intended for other market shares such as experts or professionals.
as long as there is no lens replacement, DOF control, no RAW image DSLRs simply cant be replaced by mobile phones. P+S Cameras might be replaced sooner or later
Although mobile phones will play a major role in the future of photography, it just does not have the latitude that DSLR's offer.