It's beyond doubt tailor made treatment options for a specific diseases and patients will help the health care system better. Amongst other things individual therapy by gene IS a viable alternative. But for the economic aspects.
Please google any similar drug's side effects at drugs.com first. Then, make your conclusion. Otherwise, to the patients, it's a potential disaster and new kind medical tragedies.
Do you make money more important than patient's life? Don't you care about the accumulated drugs' toxins in the environment and patient's prescription drugs are adding more and more?
Even bargain for lower drug's price. Eventually, in overall, you make more money.