Former CEO of AXA, a major French insurer, famously announced that a world at +4°C would be "uninsurrable" [1]. That was 10 years ago. It's true that most predictions about climate are wrong - most of the time, they're optimistic. (Not always, fortunately [2]) [1] https://www.leparisien.fr/economie/business/special-cop21-un... [2] https://www.theclimatebrink.com/p/emissions-are-no-longer-fo...
if it did (which is not probable) happen it'd take until the end of the century
if we were to get there the entire world will be a different place; everything will have advanced so we won't be insuring our present world with our current knowledge and current tech but a future world with future knowledge and future tech