You won't see A2A drones for at least another decade. In a non-contested environment, dropping Hellfire missiles is easy from a slow moving drone like a Predator. But this won't occur against a peer enemy. It's too easy to shoot them down.

As to A2A, there are far too many obstacles for this happening soon.

Plus, there's the whole notion that in a conflict against a peer opponent, that we'll somehow be able to manage the command and control of drones; that the opponent won't be able to disrupt our satcoms and other control channels. This notion is a bit naive. There will be a place for a man in the cockpit for quite a while.

A short range, relatively dumb, more or less autonomous "air-to-air drone" is also called a missile.

We already have human piloted aircraft carrying and launching what amounts to air-to-air drones. Essentially a modern fighter is a flying aircraft carrier which carries a load of short range drones.

There are some interesting optimization problems where the shorter the range, generally the faster and more maneuverable and effective the weapon is. I think a 500 mile range air-to-air cruise missile would be pretty ineffective and easy to avoid compared to a modern short range missile.

This is more conjecture, but I don't think this is so much a capability problem (they're already mounting stingers on drones; larger models with large electronic sensor platforms/radar and sidewinder/amraams are just a matter of time). The problem remains rules of engagement, which are currently easier to verify/enforce with a human in the seat.