All of the Cambrian biodiversity was underwater, with nothing larger than bacteria on land. Would you consider it a good thing if the world suddenly flooded? (

All of the Cambrian biodiversity was underwater, with nothing larger than bacteria on land. Would you consider it a good thing if the world suddenly flooded? (In case the point isn't clear: even if we exactly reverted to Cambrian conditions, that would be Bad for humans (there were no humans in the Cambrian) - but that wouldn't happen anyway, what would actually happen is everything would die from the sudden shock.)