
michaelemouse wrote:2,3, 4, 5: All of those can be obtained by having a different view of what a fighter is. At some point, it may be determined that greater stealth, payload and range matter more than speed and maneuverability which could lead to "fighters" being flying wings.
From WWII onward, the US has used the motto that you never use manpower when you could use firepower. Lately, an equivalent motto has been that you don't send an aircraft when you could send a missile; The missile is much lower risk while being faster than an aircraft. If you extrapolate from that, it may be more useful to have an aircraft which isn't that maneuverable and only goes high subsonic if it allows you to have much higher range, loiter time, payload and stealth and instead rely on missiles/drones/probes when you want something fast and maneuverable.
Could well be, but at least currently fighter speed and maneuverability are very important in avoiding missiles. While they are very difficult to avoid when they have a lot of energy, their ability to catch fast and maneuverable targets pretty quickly goes down when the missile speed and energy go down. Of course missiles with ramjet or pulsed rocket motors are better at keeping the speed and energy higher for the terminal phase. But even then the thrust time for the motor is limited. But there might well be some point where speed and maneuverability become significantly less relevant than today. Missiles might get just too good and stealth, EW, DEWs or miniature self defence munitions are the only good answer.