Free verse was not the end of verse; the shift from auditory to visual culture was the end of verse. Arguably, the great poetry of the 20th century was still grounded in meter, and a certain familiarity with orality, rhythm, metricality. Now, also arguably, Instagramified, poetry has become purely visual, largely about typography and arrangement on a screen-page.1
There's always literature, and there's no doubt that something approaching great literature will be, will or has already been written on smartphones, or even on Twitter—or whatever comes next. The brain is inventive, and genius seeps through the cracks of all kinds of banality, like grass pushing up from a sidewalk. Grass will always grow. Macadam will also surrender back to nature.
A book about 19th century thinkers could be called “The Temptation of the Secular”: