Worrying about current climate and climate change may not be the most important factor when thinking about homesteading 80 years from now. If you factor in the out of control population growth, along with its accompanying cascading need for more food and resources, I wonder......something to think about. Plus, with the escalating effects of population growth and its affects on climate change, what will climates be like 80 years from now?
The economists I've read tend to predict the urban and suburban areas dramatically increasing due to the simple fact that all those extra people have to live and work somewhere and the rural areas don't offer the jobs anymore. Thus rural areas may offer the best option for homesteading activity.
That being said, I'd be looking at remote mountain areas where "modern" people tend to avoid due to the fact that "modern" resources are scarce and more difficult to get to those areas. Forested mountains indicate a water source somewhere, somehow. Homesteaders tend to utilize local, natural resources rather than buying everything at the store. Forested mountain areas might sustain homesteaders best, and if they are within a few hours transportation to an urban area, then even better. An hour from a suburban area might be better yet since the homesteader could sell their excess or goods to the mainstream population living there.
I'm homesteading on an island out in the middle of the Pacific Ocean. My area is a poor rural district that offers very little of interest to the wealthy. Wealthy people drive through.....don't buy houses here. Thus this is a good area for homesteading. Remote enough to keep the housing boom away, but a steady stream of buyers for excess farm products. Wealthy residents a 1 1/2 hour drive away. Adequate rainfall due to the mountain behind our farm. Moderate climate, even if it gets a tad warmer. Yup, I landed in a good spot. And while this area may increase in population over the next 80 years, I don't foresee extensive development. There are other locations on this island that are far more appealing to the wealthy. I don't intend to move, but if I did, I'd try to replicate my situation ---- semi remote & rural, mild climate, a mountain to give rain, wealthy population an hour or two away.