True from an engineering standpoint, and the Air Force already did that (jamming pods on C-130s) and picked up
some but
not allof the Prowler mission. There is some capability overlap between those platforms but they are not the same thing and each can do certain things that the other cannot.
I think it's moot anyway, because airborne EW is already coordinated by "higher" echelons- as it probably should be and will continue to be. (With due regard to OPSEC, suffice to say there are good reasons for this.) Therefore it might be a tough sell to start up a USMC EC-130 program when there is already a similar and mature USAF EC-130 program.
Now from a doctrine standpoint would the Marines really want an organic weapons system that is a single platform with significant (kinetic) fire support
and ISR
and EW capabilities? Kind of an open ended question here