The fall of Louisbourg exposed serious flaws in the structure and readiness of the French army, especially when compared with the British. These exposed flaws not only impacted the morale of French troops, but also of French civilians. With British domination at sea, France no longer controlled the St. Lawrence River. This meant that the French could not receive reinforcements or supplies from Europe. The British were able to use their control of the sea to attack other French settlements in North America, such as Quebec and Montreal.
The fall of Louisbourg also dealt a serious blow to the French economy. The fortress had been a major center of trade for the French, and its capture meant that France lost access to a vital source of revenue.
The loss of Louisbourg also affected morale in France. The fortress had been a symbol of French power in North America, and its fall was seen as a major humiliation. The French people were already demoralized by the Seven Years' War, which had been going on for several years, and the loss of Louisbourg only served to make matters worse.
Overall, the fall of Louisbourg was a major setback for the French. It had a devastating impact on the morale of the French troops, the French people, and the French economy. The fortress was never returned to France, and its capture marked the beginning of the end of French power in North America.