The underlying foundation of all religion is performance - whether it's a tribal dance around a campfire to satisfy the fire god, or a dead religious activity performed week after week by an evangelical Christian with the intent of impressing his God. It's all religious performance, and God isn't impressed by our performance. What impresses Him is faith.
I am not dogging on non-melodic pop music because I love it, but I am saying that is why the timeless songs are still here. It's because of the melody. As far as what shouldn't be brought back, the high-waisted bikini bottoms.