Is "digital-only" the future of OPEN ACCESS journals - or are pre-imposed PDFs of feature articles the printed 'offprints' of tomorrow ?

A serial that is OPEN ACCESS (the ponderous academic term for what you and I, the little people , would be content to simply call "free-to-read" magazines) can hardly afford to provide endless amounts of mailed out printed "offprints" of its longer "feature" articles when it has *little or no income -- so what is the best solution ?