Yes and no. It is true that people with celiac disease are genetically predisposed to developing the condition. In fact, family members of people with celiac disease are ten times more likely to develop the disease than the general population. However, not everyone who carries the genes develops...
At this point, there is no known cure through which a celiac could once again eat foods containing gluten without damage to the intestinal mucous membrane. The only solution is a gluten free diet.
At this point, it cannot be proven that the later introduction of types of grain containing gluten into the diets of small children can prevent the coeliac condition. In the best case, the symptoms may be delayed, but they will just appear as soon as gluten is ingested with food.