It will be much cheaper to send in 100 tiny drones to kill one enemy soldier than to send in an American soldier. And it will be safe for Americans.
Once you have enough of the drones and they are small enough, you can launch swarms of them inside, outside, over ground, under ground, in daylight and at night. The enemy might be able to shoot down 99 percent of them, but you only need one drone to take out the enemy. You can chase down the enemy soldiers, one by one. You can even avoid civilian casualties by spending enough time to establish who's enemy soldiers and then take them out with precision. Even - to a high degree - if the enemy hides among civilians. Once the target is eliminated (or has surrendered), you can return any surviving drones or have them destroy themselves.
Once war becomes safe and clean for Americans, there will probably be less objections against war. Another Afghanistan will take a few weeks or months, not 15 years. Americans will actually be able to win the peace, not just the wars like today.
When the enemy realises that there is no-where to hide, they will surrender. Americans can basically engage anyone, anywhere, at all time and in no time, with no apparent risk at at little cost.
Of course, the threat of a nuclear retaliation would be the most effective defense against such drone based wars, so I would expect more of the dictatorships to attempt to acquire nuclear weapons.