There will come a day, I think, when UAVs will perhaps replace manned fighters, certainly augment them more than they are today. I don't think we're there yet. I think the opportunity for that will evolve as the technology evolves. Just the mechanics of operating a UAV in domestic airspace has its own issues that have to be resolved.
Certainly, UAVs have the ability to provide a persistence and endurance that you cannot achieve through any manned aircraft, certainly not a fighter, which offers an advantage. There's a project to address that within the Department of National Defence.
There always will be, though, a desirability or an advantage to have a person on scene to provide the so-called man-in-the-loop decision-making process that you may not be able to achieve with the UAV. I think most people agree that the days of the fighter are giving way maybe not completely but gradually to UAVs.