True, but they shouldn't have to; there's no such thing as a free lunch. If you want the plane to be a strike fighter, it won't be a great air-to-air fighter. It's like trying to do air-strikes with a Spitfire/109 rather than a Thunderbolt or 190.
That's why you have many classes of fighters, to deal with everything effectively. Also, just pondering here, but I don't think that our real-lifel enemies, the Taliban/Al Queada/Myriad Arab Mafias don't have an air-force to oppose us doing air-strikes.
That means that a Predator, or rather, a bunch of predators, would be the way to go. They're cheap, easy to fly, and nobody gives a darn if they get blown up. Not only that, but the new versions can carry far more missles than the current predator (if only you could get a Vulcan cannon on that thing!).
In conclusion, we aren't about to fight an air war any time soon. Which means it's a good idea to focus on air-to-ground for now, and cross the air-to-air bridge when we find and get to it (hopefully never, war only destroys).
-Penguin