Preservation is an ongoing source of concern with regard to digital scholarship—something even a go-online, go-OA advocate such as myself can appreciate. But it can’t be left to commercial enterprise, either. (Though see also Dorothea Salo’s comment concerning HathiTrust and Portico—and nobody mentioned LOCKSS at all.)
It’s pretty clear that library spaces have to reconfigure or go away. The one where I work is one of the busiest buildings on campus, but it’s a study and collaboration space (with research assistance) rather than a place where one goes primarily to browse or locate print journals.