On the one hand, reducing obesity by 15-20% with a pill is pretty amazing. That certainly reduces negative outcomes and improves people's lives (and saves society money).

On the other hand, pharmaceutical companies only care about money and the chemistry is pretty straight-forward. They will continue making new drugs, and they will certainly release a "newer and better" version when their patents run out.

But, there will certainly be unintended consequences, and we still don't have a good understanding of the cause of the obesity epidemic.