There will never be smartphones that can replace DSLRs because the range of objectives smart phones can have on them is severely limited. Also, smartphones have smaller sensors than DSLRs.

That said, low light photography can be vastly improved with advanced noise reduction algorithms if a smartphone has takes a sufficient number of shots of the same frame. A friend of mine has the latest iPhone and the camera software on it is really amazing. It takes a lot of processing to get clear images under such lightning conditions where a normal person has difficulty seeing properly. He showed me a shot if his kids sleeping in their room that was taken when the room was dark and the only light coming in was from a very narrow opening between the door to a lit hallway and the door frame. Everything looked as if the lights were on in the room. He had taken another shot for comparison with the camera in a normal state and it was nearly impossible to see anything clearly.

But if you want to take a clear picture of a far away object you can forget about it if you're trying to do it with the kind of short focal length lens typical of a phone camera.