I think a rogue state with drones is about as dangerous as a rogue state with a well-equipped army. (note: all of this pretty much assumes something like the next ten to fifty years of physical tech, and that drone AIs are very focused. If AI supertech or extremely tiny deadly drones come into it, it gets much worse.)
I think that drone armies compared to human armies are better for short-term slavish loyalty (including cases where the chain of command is broken). However, unless they are controlled by a stable, central entity (such as the case where a tyrant uses a drone army to suppress rebellion) with all the infrastructure then maintenance and a wide variety of other issues start to become a big problem.
You might get some Napoleons.
I also think that drones are likely to be poor substitutes for infantry out of actual combat.
I think a rogue state with drones is about as dangerous as a rogue state with a well-equipped army. (note: all of this pretty much assumes something like the next ten to fifty years of physical tech, and that drone AIs are very focused. If AI supertech or extremely tiny deadly drones come into it, it gets much worse.)
I think that drone armies compared to human armies are better for short-term slavish loyalty (including cases where the chain of command is broken). However, unless they are controlled by a stable, central entity (such as the case where a tyrant uses a drone army to suppress rebellion) with all the infrastructure then maintenance and a wide variety of other issues start to become a big problem.
You might get some Napoleons.
I also think that drones are likely to be poor substitutes for infantry out of actual combat.