> These days, everybody is an expert photographer

If that were true there would be no wedding photographer's or any sales of high end DSLR's. The barrier of entry may have fallen but the need for real experts and tools still exists.

I expect AI's will cause a similar shift, lower barrier to entry but still requiring the hand of the expert in critical situations.

This fails to take into account a pervasive, global lowering of standards on all fronts.

Who will retain the good taste to keep paying a premium for professional photographers, etc?

Just wait long enough