We will but not at our current numbers. Rich countries will suffer the most.
What do you think will happen next? What will happen is Brazil will start planning for it, and then they'll be fine. There will be an adjustment period, and then, life goes on.
Like literally it’s already too expensive to keep doing it without a massive funnel of taxpayer money into peoples beach houses. It’s literally only viable to keep doing that by leeching off the largesse of the taxpayer and other homeowners in less dangerous locales.
Florida also has the additional problem that it’s literally built on karst topology, it’s limestone riddled with tunnels and sinkholes so water comes right up under it, you can’t even pump the cities dry like the Netherlands.
With >300 AQIs in most highly-populated areas, dirty water from rivers almost all of which are hazardously polluted, combined with a tropical climate that's already hot enough to kill thousands of people from heatstroke alone in summers - pollution-related misery in US and Europe isn't anywhere close enough to that in India. It just doesn't get called out because Indians have bigger existential concerns (many of which go directly against climate-friendliness).
....until the migrations.