From the article:
...could lead to doctors prescribing personalized diets for patients based on the unique composition of their gut flora.
That sounds great. It would also be better if doctors and nutritionists based dietary intervention on glucose tolerance and insulin resistance instead of a one-size-fits-all mentality.
BTW, rodents in studies that say "high fat diet" are really get a high processed carb plus high fat diet, which is not something they tolerate well.