Tons of Future Use Cases
Drones are versatile enough that they will likely be used to perform tons of specialized tasks in the future, even more than they already do now. Drones have also been used in the military for a long time. Here's a few drones in flight:
Core Advancements
Versatility
Drones can be used for so many things, such as: delivery, military operations, photography, mapping out unexplored areas, farming, or just as a fun hobby. I've even heard of drones being used to put out fires
Speed
Drones can easily cover long distances in a very short amount of time
Challenges to Overcome
Weather
All-weather drones are difficult to build and often can't withstand extreme weather conditions
Maintenance
Drones have many complex parts, these often need to be fixed or replaced