There is always a chance for any weight loss surgery to face weight gain or failure. The problem with a gastric balloon is after it is removed, there is nothing besides willpower and determination in the way of regaining weight and going back to bad habits.
This is why it is so critical to be 110% committed to making serious lifestyle changes. These include dietary changes, exercise, portion control, post-op diet, and changing your overall life. Conversion of failed stomach balloons can be done through stomach stapling.