Considering the advance of lightweight materials, CPU's, and software, it's only a matter of time before we can build an unmanned fighter that, like the fictitious Peacemaker, can fly rings around F-22's.
With the pk (probability-of-kill) of modern air-to-air missiles being so high, if you've merged into a "knife fight in a phone booth" scenario then you've most likely screwed up. Air combat today is basically sniper-v-sniper with the advantage going to the pilot who sees his enemy's aircraft first. "First look, first kill," is the term of the art.