I've seen a lot of research and discussion on this issue. Every single drug has side effects. But the data I've seen so far is pretty clear, the benefits far outweigh the negatives as far as reducing obesity, which is already leading to significant positive health outcomes in the general population. We'll see what happens over time, and definitely should continue to monitor the results.
I should add there are people out there who are normal sized but still take them to try and get super-thin. That is abusing their original purpose, but that's not the drugs' fault.
Also, nobody "has to" do anything for their whole life, including taking an obesity pill when they're no longer obese. If they start gaining it back, again, that's not the drugs' fault. They are simply a tool in the tool box, and quite possibly the most effective obesity tool that has ever been invented.