I never believed the widespread assertion that air combat is too difficult and complex, so manned fighters are unavoidable.* (I'm nevertheless not convinced that unmanned combat aviation is the way to go, except for extreme aircraft; small size, high endurance or high altitude).
Now there's some substantial support for this view:
Especially defensive (dodging) manoeuvres against incoming missiles are almost guaranteed to become automated (though triggered by pilot) once the necessary 360°x360° sensors have become common. That will likely happen in the 2020's, as systems such as the DAS can be retrofitted to existing aircraft (the typical missile warning sensors of today aren't as capable).
*: Air forces are largely run by generals who used to be (fighter) pilots, so the 'experts' in the armed services have a conflict of interest and the retired experts are emotionally compromised and thus biased on this issue. A pilotless air force would be more than a technological shift; it would be a cultural and organisational break. Air forces would also lose much budget, much personnel, much prestige and many slots for officers if fighter wings were turned into missile battery-like organisations that do not need to have flight training on most days of the year.