I think the F-16 would be grounded before the F-18 would be for America. F-18s are used by the Navy and Marines. I know Marine pilots are taught to fly with no electronics and I'm guessing the Navy pilots know that as well, so I'm pretty sure they can keep going even without all the fancy do-dads and gizmos buzzing and whirring.
F-4s I could see coming back, but I think they'd keep F-15s around as long as they could. They're an old enough aircraft they could probably make do for a while longer than something else.
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