The only time an enemy was bombed into submission involved nukes.
Drones have been shown to be effective for hunting down and even destroying the enemy on a tactical level, and have proven to be effective anti-armor and antipersonnel weapons with the right payload.
Strategic strikes on logistical targets have the potential to hamper enemy activity, but are reminiscent of the 8th Air Force campaign against the Nazis. While it certainly reduced Germany's ability to supply their troops, aircraft production actually increased. The key was in destroying fuel supplies. Despite having the most advanced fighter aircraft in the world, Germany barely had the fuel to fly them, and not enough to train pilots to do so.
It would be folly to not incorporate the capability of drones into front line combat, or to utilize them to cripple an enemy's logistical trail, but in order to prevail, the enemy's space must be either occupied or rendered unlivable.
While, theoretically, it would be possible to target an enemy's organic ability to produce war materiel, or even their personnel in bivouac or in transport, this does not force them from territory.
Keeping in mind that armor (or any vehicle) is subject to being destroyed by an enemy drone, the ability to bring the biggest gun to the fight still has merit. Infantry and the ability to occupy the space the enemy formerly occupied and to prevent the enemy from occupying your space remain the basic concept of conquest.