Question: How did Nicolas Cage manage to keep his job for so long? You'd think he'd get fired for coming to work drunk the first time.
Answer: Most workplaces I know have to try and help the employee to an extent, especially with mental health or addiction, even giving three chances. This, of course, might have been different in the time this movie was set, however.
Question: Is Leaving Las Vegas an accurate depiction of alcoholism and intoxication?
Chosen answer: Like any cinematic depiction of ANY behavior, "Leaving Las Vegas" is a depiction of extremes of behavior. Keep in mind that Nic Cage wasn't merely trying to catch a buzz in this film, he was trying to commit suicide-by-alcohol, which is extreme. If anything, Nic Cage's performance was far too animated and articulate for someone dying of alcoholism. Seldom are the final, terminal stages of alcoholism worthy of depiction in a feature film. So, the answer is no.
Chosen answer: On the contrary, the social contacts at work typically tolerate, sympathize with, and even enable alcoholics and other substance abusers, because many of the other employees are also similarly (and secretly) engaged in addictive behavior of their own to varying degrees. Usually, no action is taken until the addictive behavior starts affecting company income, insurance and morale. So, some substance abusers can lead lengthy careers within a company before the hammer falls.
Charles Austin Miller