I'm really not sure how they work, but I assume Dark Horse retains the rights to Star Wars books they've already created, right? I assume they can sell them/publish them into perpetuity. They just won't be able to create or market any new ones? As such I'm not sure you'd lose access to current Dark Horse comic books you've bought.
Of course, maybe they'd be forced out of print, and so would the e-versions...not sure.