Holdon let me put it this way... How many times do u hear people listening to the song P.I.M.P by 50 cent? Never even though back when it came out you would find it coming out of everyones headset.
Now how many people still listen to the song Thunderstruck by AC/dc many many people now that song that was made 17 years ago is still listened to more than a very popular song that was made 4 years ago. Which proves how trendy rap is. People listen to a song for 3 months and they get sick of it.
Ok. Your claim is said but if you choose another 50 cent song from the same era, say In Da Club, still listened to. I actually still hear it on the radio. Or LL Cool J's My Radio is still on the radio. Also ACDC has songs that are not listened to very much any more or played on the radio. Like Money Talks or For those about to Rock. Those are songs you dont hear very much anymore. So your statement can go either way to help or hurt you claim. Either way, its hard to clearly make a determination here. It is all personal preference as people have said. Both genres will always be listened to. And I listen to both actually.