I think the whole philosophy of the paleolithic diet is very interesting. Would make for a great debate about the genetics of type 2 diabetes! I feel the different 'diets' vary because with them come different cooking techniques and ingredients. Efficacy comes from the quantity and the glucose excursions they incur. Modern diets have 'calorie' pollution. However, we live longer than our paleolithic ancestors - long enough to get Type 2 Diabetes.
There are a number of people who have reversed the metabolic features of Type 2 Diabetes through sheer determination to lose fat, gain muscle (and insulin sensitivity) and exercise. Bariatric surgery is very effective at weaning off drugs as well.
Before the discovery of insulin extremely low carbohydrate diets (The Frederick Allen diet http://centennial.rucares.org/index.php?page=Dietary_Therapy_Diabetes
) was used with some short term success (in keeping people alive) with Type 1 Diabetes.