Since it's so new, of course there aren't any long-term data on GLP-1 takers. However, relying on prior knowledge about people who are good on the metrics, it can be presumed that they will do fine. And won't create financial risk for the insurer due to passing on earlier than expected. But only if they keep taking their meds and/or fix any underlying behavioral and health issues that made them obese in the first case!
Regarding the graph about slippage: yes, that looks like the Covid peak. However, even assuming this recent trend is an anomaly, the industry is in a changing landscape and needs to adapt. New metrics and criteria, and the fastest mover will capture the market. Business as usual.
I don't feel sad except for the people who managed to bring their health issues under control and now can't get life insurance.