what happend to radio shows? not liek talk shows but the ones that were radio plays?

SO to clairfy. im asking what happend to the radio shows that were essentially plays on the radio. War of the worlds was orginally a radio show. I like that sort of thing cuase it stimulates my imagination to think about what everything looks like. plus i can enjoy it more cuase even though its fleshed out written. i can see what i want to see. :)