There is plenty of potential in Autogyros and they are certainly still being made.
Perhaps a UAV autogyro powered by a small jet with some of the jet high pressure gas tapped off and piped into the rotor system to create a rotor tip jet propulsion to spin up the blades for a shorter takeoff run, or perhaps gearing from the engine to do the same would allow short takeoffs and the potential for low power cruising and low noise for observation flights.
Potential also for UAV use too as it wouldn't need a long runway, esp with a partially powered rotor.
and scroll down to the IRKUT Corporations A-0002 lightweight Gyroplane video.
Should add that one of the extra costs for UAVs is their limited lifespans, or takeoff and landing cycles compared with conventional aircraft that use runways. It might be more conventient to recover a UAV in a net or by parachute but it involves putting stresses on the UAV that normal aircraft don't endure meaning a UAV might only be good for 500 or 1,000 landings compared to 10,000 landings for a conventional landing UAV. Of course a conventional landing UAV takes up runway space and time and cannot be deployed to some areas leading to super large and super expensive extra long range UAVs that takeoff and land from normal runways but can loiter over the target area for long periods... but because they are based a long way from the target area they can take a while to get into position.
Using an Autogyro for a UAV means that no parachute system is needed, nor is a significant runway as a short stretch of road or flat land free of rocks would suffice for takeoffs and landings.