Things , techs, that could reasonably be projected to affect the world at large in under 90 years?
A big one is power availability and sources. Energy availability and cost makes a primary difference to everything. On the boards today, are concepts for Fusion power, Broadcast power (especially space based solar collection, and panel efficiency generally, Thorium reactors, other natural sources besides solar. Another area is bio-research, or medical research. Affects are longevity, health, intelligence, population growth, and economic issues such as size of working population as opposed to consumption and the retired population.
In transportation, the focus is in speed, ease and perfection of control, Traffic control, and power. These are the issues that keep flying cars off the to-do list. Current autos pollute, use vanishing resources at astounding rates, are increasingly expensive, and are loosing ground in terms of origin to destination times, land use, and infrastructure requirements. Cars only have to roll across the ground. Bicycles can do that powered by children’s muscles. The power difference for guided flight is orders of magnitudes greater. Planes cannot stop on a dime, turn sharply, and are affected by uncontrollable natural forces such as wind…
Changes in city and community architecture and design could solve much of this, and several other factors mentioned and unmentioned. I expect power advances, medical advances, transportation advances, and architectural experiments to go on apace over the next 80 years Given human proclivity to stick like school paste to old forms and ideas, I am pretty sure these will not be globally applied, but area dependent. I don’t think the bushmen culture will entirely disappear, for instance. Maybe, but cultural motifs have a habit of dragging on and on and… Well.
While all of these will undeniably go forward, to what extent, and how driven, and by what specific instances, is the guesswork of SF writers, and the plot jelly of most such adventures. You must engage your sense of what if, and pull up the causes and effects yourself.