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In my experience, people who study climate change are planning for this last scenario in their own daily lives. At work, they write about the RCP2.6 path and how to get on it. At home, in their free time, they fight to get their communities on the RCP2.6 path. But when their day is over and they are sitting on the couch, they make choices that reflect their worry that we are probably on the RCP8.5 path. They look online at properties in, say, Canada or Sweden. They talk to real estate agents and ask questions like, "Does it have year-round flowing water?" They have conversations with their partners about which countries have stable governance and won't have malaria. With insider information and disposable income, they are preparing in advance to flee.
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Rob Dunn (A Natural History of the Future: What the Laws of Biology Tell Us about the Destiny of the Human Species)