In the air, for example, I expect to see the F-35 slowly morph into an aerial command center for drone wingmen, the latter of which take a more front-and-center role in the operation, while the latter takes the rear and focuses primarily on operations management.
For the drones, take the human (and all of their associated weight) out of the equation. Eliminate the need for a high level of redundancy and general safety, and give the airframe maneuvering ability beyond what humans can withstand. Make them cheap, capable, and in large numbers.
You know, you can sort of envision the progressive distancing of “humans” and “value” from the battlefield. A carrier keeps its distance with aircraft. A manned aircraft keeps its distance with drone wingmen. A drone keeps its distance with standoff weaponry. A standoff weapon might in turn deploy numerous individually-homing warheads with increasingly sophisticated target identification and tracking capabilities, effectively MIRVing the final approach. Etc.
We already have a supply of very capable air combat drones. Modified F-16 and F-15, to either charge in and make the enemy decloak, or to serve as missile trucks. No doubt they’ve brainstormed other scenarios even more clever.
As you say, since drones will be unmanned and expendable, we can crank out lots more relatively easily. Instead of dramatically scaling down an F-16, you could think of slightly scaling up a MALD and giving it offensive capability and stealth. (Miniature Air-Launched Decoy). When it’s fired its complement of one or two missiles it could seek a final kill by collision.
I doubt there will be a sixth generation of manned fighters until much later in the century, if ever. Air combat will just be too quick and brutal for the mortal coil to endure.