All you say is possible now but they will still keep man in the loop for the foreseeable future. Robots may play a factor as far as freeing up the humans on some tasks.
The cheapest and very effective anti-missile technology is a loadmaster looking out a troop door with a chaff and flare release control. WW2 technology still being used.
A drone cannot tell the difference between a school bus full of kids or one full of people wishing to do us harm.
I am not sure how current your knowledge is. We already have antiair systems that wouldn’t give your loadmaster any chance to recognize the threat much less react to it. Chaff and flares only work on slower shoulder-fired heat-seeking missiles. There are also target recognition technologies that will differentiate between different types of hostile people and friendlies/noncombatants. It’s not 100% yet, hence the wait. Robots will eventually take up all combat roles - possibly within our lifetimes. Drones are only the first rung in the ladder.