This may be heresy of a sort, but I'm looking forward to a time when a simple pair of lightweight eyeglasses will reveal the world in both "nightvision" and thermal imaging, doing away with flashlights for most night tasks, with the possible exception of true color rendering. (I hike at night regularly, in case you're wondering where this fever dream originated.)
On a more realistic plane of existence, I'm also looking forward to the development of a solid state battery that never leaks; holds a charge for months without any loss of power (OK, maybe a negligable loss); recharges in seconds; and has exceptional capacity and a lonnnng runtime at high output. (A guy can dream, can't he?)
Oh, and my fantasy battery shouldn't cost more than US$10.