How does everyone everywhere having a really decent camera ruin photography? One of the things we had to do in photography class was use a disposable to take well composed shots (but also we developed the film ourselves). A phone camera would make those look way better.
Photographic art is drowned in a world of snapshots. That which we obtain too cheaply we esteem too lightly. Of course, there are a lot of awesome upsides and people can still do photography as a hobby, but there's a real "you can't go home again" feeling. You probably would have had to been into the hobby prior to the smartphone to appreciate the loss.