At that time, if things don't improve by a huge margin (like in : never before in human history; except maybe at WW2 levels), hundreds of millions of people will have moved away from their birthplace (taking the place of other who may or may not be happy with it, which may lead to "tension" between populations; see what happens today when a few refugees (yes, a few) reach the borders of Europe...)

My understanding is there will be many more losers than winners.