This is already a concept - you swam airspace with a bunch of cheap(er) missiles to let the ones that count through. Or, ships now just launch a salvo and hope

This is already a concept - you swam airspace with a bunch of cheap(er) missiles to let the ones that count through. Or, ships now just launch a salvo and hope SOME get through. The problem is that for something to be as big as, and got as fast as even a Tomawhawk (which is slow), it's still going to cost.