Well its certainly on the endangered list right now, and seems like "on life support" might be on the cards within the next decade.
It will stick around in its ever-diminishing form so long as the generations who grew up routinely talking about movie trailers and lining up outside a box office is around, but those people are all over 35 now, and every year brings more online/home-based/phone options and distractions.
Along with malls and offices, it seems movie theaters are yet another outdated physical world phenom that is slowly dying as the online world takes over.