1. Drones can handle much higher G-forces than manned fighter jets. This is a huge advantage.
2. AI technology is progressing very rapidly so there will soon be no benefit to having a human in the aircraft. Even today the US military probably has AI that can beat any human in a simulated dogfight.
3. Pilots are very expensive. Not just to train but also in terms of the political cost of having pilots killed or captured by the enemy.
4. Eliminating the pilot opens up a range of options. For example, instead of a $200 million fighter jet it may be more effective to build 10 drones for $20 million each, or even 100 drones for $2 million each. Maybe half the drones will have stealth capabilities and half will have AWCS-like communication and control features.
5. During WWII German and Russian tanks were roughly equivalent. But the Russians could build tanks at a far greater rate than the Germans, making the German loss almost inevitable. Similarly, in future the country that can produce many drones quickly and cheaply may dominate air warfare. In this regard China will likely have an advantage over the US.
6. The military-industrial complex is a huge bureaucracy in which many people have a financial and psychological incentive to continue development of manned fighter jets. For this reason I expect such development to continue well beyond its use-by date, probably until there is a real-world battle where a large, previously dominant air force is soundly beaten by a small power using new drone technology.