The best replacement for drones is fighter jets.

The best alternatives to drones are rated as following:
★★★★★  fighter jets
★★★★★  pilots
★★★★  uav
★★★  fighters
★★  heavy drones
★  worker bees
★  ufos
  sentry drones

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Speaking about drones, one probably shouldn't forget about drones.

Other search terms related to drones and their ratings are:
★★★★★ drones
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Google Trends

Scale is based on the average worldwide traffic of drones in all years. Click on graph for more.
drones
fighter jets
pilots