20-Year Prospect
The movie industry may be slagging, but it isn't going anywhere. Newspapers and magazines still exist, even if it's mostly just online. So in addition to all of the film blogs, there'll be places to review movies. And let's face it: we aren't going to stop being picky consumers. We'll always want to know whether something's worth our time and effort.
As long as Freedom of Speech is still a thing, this career probably isn't going anywhere. And who knows? Maybe our future alien/robot/mutant gerbil overlords will still want to hear about the next Fast and the Furious film before they drop their hard-earned future bucks.