There are plenty of people who cant afford to have their genome mapped today. Its only cheap relative to how expensive it used to be
It'll be $1,000 later this year. And in a couple of year it will be less than $100 and could become an app on your phone. The fall in price of genomic sequencing has been so amazing that its even outpaced Moore's law by a great deal. Just remember that Steve Jobs got his genome sequenced a couple of years ago when he was dying hoping scientists could find something in there that could cure him and it cost him $100,000. Now its $1,000 which should make it affordable to anyone with a medical condition. In 2 years, it'll be cheap enough that everyone, even those who don't have any medical issues can get their genome sequenced.
A $100 genome being sequenced in a few hours is very much within reach the next couple of years. Once that happens, I think almost everyone will get their genome sequenced. And once we get the genomes of billions of people into large databases, we'll be able to analyze disease and cures more efficiently.
The biomedical revolution is already here. We're just at the quiet before the storm.