The endgame is ensuring that everyone has access to scientific research. Whether or not the publishers continue to be in business is not relevant, as long as we are able to wrest away the literature which they are holding hostage.
The digital library wouldn't vanish even if Elsevier filed for bankruptcy. But even imagining some James Bond villain destroying all copies, the journals would be digitised again from library copies, possibly something like the Google Books initiative. The libraries wouldn't fall twice for a partnership with a cartel creating newly exclusive rights.
the right to post a pre-print version of the journal article on Internet websites including electronic pre-print servers, and to retain indefinitely such version on such servers or sites for scholarly purposes (with some exceptions such as The Lancet and Cell Press. See also our information on electronic preprints for a more detailed discussion on these points)*
Unfortunately, that excludes some of their best publications.