I am sure that there will be many differences of opinion, when it comes to this quote. Here is how I take it. Poetry, like many other creative outlets, is able to look at even the most ordinary thing in a fresh and new perspective. Through this act of seeing or we can say "re-seeing", poets can create something insightful.
In light of this, all things are useful. All things are useful, because meaning is not always located in the thing itself; meaning is created in the eye of the beholder as well. In this case, it is the eye and mind of the poet. For example, Robert Frost's very famous poem, "The Road Not Taken" is about two roads, but it is about far more. People interpret this poem in many different ways, because the poet opens up new vistas of sight.
My belief is that no matter what technology we gain throughout the course of History we will always thus progress with our tools in our disposable. A good example is that of Leonardo Davinci even his technology and writings where not entirely useless he was perhaps endowed with the future his writings even helped during transplants of his writings of anatomy, but to a poet it might also mean that old writings which I like more than terrible modern day novels are perhaps just as good as todays literature if might be right these two are the answers to the quote. Hope you reply with your thoughts these are mine.