It'll be interesting to see if other things are sequenced as well. Histone mapping comes to mind. Histones are responsible for packing the DNA and exposing different segments. This is one major factor in why we have some many different types of cells with the same DNA.

You could also sequence bacteria, viruses, tumors, and many many more. It could also impact agriculture as well. Once sequencing becomes cheap enough, I think it'll extend far beyond a one and done test per person.