small, lightweight, self contained modular assist systems - think something that goes entirely inside the downtube, battery and motor, and directly turns the crank through the bb

fully electric mechanically decoupled drivetrains - a tiny generator on the crank and corresponding motors in the hubs. no gears no chain. regen braking, with some kind of simple electromagnetic brake for emergency stops.

one piece 3d printed bikes, custom fit based on body scanning while riding, walking, sitting, standing.

embedded tracking tags inside frames, forks, wheels etc to make them more theft resistant

integrated low voltage power systems to allow lights, computers, etc without additional batteries and wires

miniature integrated displays in stems to eliminate separate computers

fully airless tire/rim combos that don’t weigh more than the current combos of rim, tire, sealant/tube.