Sampling ultimately pushes the culture forward because more art is being created. And I'm saying the word "culture" because it doesn't just affect music, but also many different aspects of influences, i.e. films, commercials, tv series theme songs, and etc.

There's one key point that you demonstrated that exemplifies sampling; those who dig into the elements of a song may be pleasantly surprised to discover that the original sample is even more enjoyable. In other words, exposure of forgotten or unknown artists/musicians is now known. I personally utilize the sampling technique to create music and I've been fortunate to discover music from all countries in all genres of all eras during the process of production. In addition, I try to make it my responsibility for the listeners to have that same opportunity to hear the original sample -- if they don't like what I made, perhaps they'll enjoy what I sampled instead.

Wouldn't it be a shame if quality music created in the past never reaches the ears of our generation?

The topic of copyright infringement and the idea of unoriginality is another topic.