Unfortunately only supervillains will be able to afford this "get out of jail free" method and then there are the inevitable surgery addicts looking for a shortcut. Combined with cloning, an entire planet of Kardashians could be created.
As this Reuters graphic shows, editing DNA using the CRISPR/Cas9 technique works similarly to the “find and replace” function in a word-processing program. First CRISPR — short for ”clustered regularly interspaced short palindromic repeats” — searches for a unique string within the DNA sequence. Once found, the Cas9 enzyme cuts the DNA at the prescribed location, and replaces it with healthy DNA...
There are also concerns that people will use the technique for purely cosmetic purposes, or that the wrong gene will be replaced, causing unwanted mutation. At the moment, the scientific community is as interested in defining the ethics of the practice as stopping it permanently.