The real question is basically - is full autonomy both technically possible and culturally/politically acceptable within 5, 10, or 20 years? Because full autonomy isn't really ready now (or else we wouldn't need hundreds to thousands of drone operators in the Ukraine war). And at least the USAF doesn't think remote control will let them do what they need (which is to fly from Japan to Korea or Taiwan, or Philippines to Taiwan, and contest/control the skies in the face of a basically peer adversary).
Because no one knows that answer, everyone (governments, militaries, manufacturers) is hedging, and CCA is part of that hedge.
>or else we wouldn't need hundreds to thousands of drone operators in the Ukraine war
I don't think this is the reason the systems are not fully autonomous right now ("fully autonomous" here meaning that they can complete the kill chain independently, no HITL). Even if we assume it true that the drones are not "good enough" to be at parity with a human operator, if you had an essentially limitless amount of them, would you really waste the manpower on operating them in FPV mode? You would not, you would completely saturate the battlefield with them. Thus, as it was in the beforetimes and ever shall be, logistics wins wars.
The said that about the 5th though. Like I've personally talked to people who were actively working on the F35 and they were saying "last manned aircraft" in like 2011ish.
I expect autonomy to be a long steady improvement of taking on additional subroutines of increasing complexity of decisions being made along the way. Fly here, land there, kill that, go over there without being detected, etc, etc, until humans are making only a select set of decisions that will probably be randomly sprinkled at the high and low levels.
Kind of like how when we build a brick wall the "vision" and the actual laying of bricks still get done by human but all the intermediary steps are drudgery that can be trivially automated (not to say they are all automated, just that they could be if labor $$ vs software $$ penciled out that way)
Obama didn't announce the "pivot to Asia" until 2012. A lot of the world was still believing in the whole unipolar moment thing. The F-35 hadn't even started training squadrons in service yet. 6th generation probably felt really far away. 2016 onwards has been a major acceleration in all sorts of ways.
In my eyes, 6th generation was really ignited by the focus on China. The PCA/NGAD/F-47 was first out the gate, and really set the tempo and got everyone else going.
I agree with your estimation of the likely development path. I expect that approach to merge/converge from the other direction - I expect there to also be a parallel path of fully autonomous systems growing to occupy ever greater mission sets. Imagine telling a drone "I need an ELINT mission in the area and timeframe" (and it plans its own launch time, flight route, calculates fuel loads, communicates with ground staff), or "I need you to airdrop this supply pallet".
I mean, they wouldn't think that, would they? It would put their pilots out of a job. But most flying has been done by autopilot long before AI, and even if/when you need a human in the loop, why would you want to put that human in the cockpit rather than safely in Virginia?