Yes, but....
There have been a number of stories about people, who having had the surgery, find ways of circumventing the purpose of the balloon. One man was liquidizing all the high fat high sugar foods he ate before, like kebabs and doughnuts and despite the by pass was as fat as ever. And he is not the only person I have read about who has acted in a similar way. It is pointless to give this operation to someone who is not committed to making the necessary changes in their life style to maintain their weight loss and lead a healthy life
As several posters have already pointed out, surgery, any surgery, has its risks and bariatric surgery is major surgery and has higher risks, not only of side effects, but of permanently damaging your health.
I do not think anyone should be offered bariatric surgery who is not prepared to address the causes of their obesity and be willing to change these habits or has been diagnosed with a problem with obesity despite a good diet and exercise pattern. In which case they should be able to follow a diet and exercise programme.
I speak with some feeling DH is obese and has mild diabetes. Recently he has faced up to the problem and we have devised an eating pattern that is helping him lose weight. His GP has also given him a referral to a local sports centre, in his case a private one, for a three month course of monitored exercise. The centre is close to home and has a swimming pool, he has always enjoyed swimming but our Local Authority Leisure Centre is too far away to use conveniently, he also has a personalised exercise programme. In two months he has lost weight and is visibly fitter and healthier. At the end of the day this is by far the best and safest way to lose weight.
What is needed is not quick fix operations that don't address the cause of the problem but support to help people find the motivation to make the necessary changes in their lives and support them while they make them.