That's an interesting take on the matter which I hadn't considered before. If insurance companies start raising rates in order to take these things into account (which they'll need to do), it's really going to drive up the cost of home ownership and make living in affected areas (which are a whole lot of places) much more unaffordable.
It's not that many areas. And if it makes such things less affordable is that actually a bad thing? People will be less inclined to live in the crosshairs on the assumption the insurance will bail them out.
Note that there's a second factor that will also apply which is a good thing--it will cause the insurance companies to be more careful about how disaster-resistant the things they insure are. As it stands now insurance doesn't look at the fire threat from other buildings. If they had and the insurance companies had only been willing to cover buildings with good resistance to embers (which certainly can be done--if you have nothing flammable on the outside of your house it's much less likely to go up when something like Paradise happens.) The result wouldn't be giving up on such areas, but houses built to not go up like that. Seen the conspiracy-theory pictures around showing the forest fire didn't burn the forest? That's because the houses weren't brought down by a wall of flame, but by wind-blown embers from earlier buildings that went up.