Even in the apocalyptic 10 foot rise by >2100, I lose some of my restaurants in Marina Del Rey and some beaches, but overall LA wouldn't notice the difference. And since our beaches are artificial, we'd just dredge more sand and raise the land level. And make new building requirements that impose a raised "ground level", since the area affected is so small. Other areas of SoCal won't be so lucky, but would still only be a minor inconvenience for the population overall. The areas affected are all places where people have the means to move without severe economic dislocation.
It looks to me like in the US, the areas most affected are those that consistently elect politicians who are global warming deniers. Even in SoCal. For us liberal Californians who don't live in the Bay Area, the ocean rise isn't even our problem thanks to living in earthquake country. And San Francisco gets away relatively unscathed, though everywhere else along the shoreline of the bay will get seriously soggy.
I suspect global climate change won't be taken seriously by US conservatives, until people have to start moving and banks have to deal with a completely different definition of "the property is underwater".
When banks lose money, conservatives pay attention.