With all due respect gpspartans, you need to study the history of Indochina. The French went head to head with the Viet Minh Divisions in the Fall of 1950 and both sides took a beating. B52s didn't stop the North Vietnamese at Khe Sanh and B29s would not have stopped the Viet Minh at Dien Bien Phu. B29s at Dien Bien Phu might have changed the Viet Minh strategy, but it would not have changed the outcome of the war. US Air Power did not bring a successful outcome to the Korean War.
B29s could only have been used in a limited role. You could not use them to break up attacks without causing damage to the French forces as well. B29s certainly could not have been used during the night attacks.