The IRIAF probably agrees with you but I can't see them replacing them anytime soon. Hows this one, I can't think of a single F-15 engagement that couldn't have had the exact same outcome had the F-4 Phantom been flying the mission in the Eagles place, yet the Eagle is the king of fighters with its 100+:0 kil ratio... In every single one of those victories the Eagle driver had the advantage of superior training and better situational awareness, if we look at lthe F-4's payload compared to the F-15's you'll notice it eaither has the potential to haul the exact same warload or in some cases does carry the exact same warload , the F-15s raw performance wasn't really such a big deal in actual conflicts.
Craig