We could save lives if we knew how to use the data of millions of patients, but this seems impossible.
See, eg,
Salerno J, Knoppers BM, Lee LM, Hlaing WM, Goodman KW.
Ethics, big data and computing in epidemiology and public health.
Ann Epidemiol.
2017;27(5):297–301.
doi:10.1016/j.annepidem.2017.05.002
One productive example of utilizing this big data in public health is the Global Burden of Disease research, with many publications that are already being translated into health reforms in many ways.
Therefore I would be more optimistic about using this big data in the health care system.
A parallel track of the Global Burden of Disease Study is the Local Burden of Disease, which is a relatively new way to transform the messages from the big data (GBD) into a focused community-specific guidelines:
http://www.healthdata.org/lbd
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