If the depression is existential in nature, then very likely not. It may be managed, but there is no real treatment or cure in my opinion. Many popular treatments for depression seem to involve some level of self-delusion and don't really get to the root of the problem—many people are fundamentally ill-equipped to cope with the pressures and anxieties of modern living. Many "solutions" are just bandaids—at least they seem that way to me.
On the other hand, if the depression is situational, then there's the possibility that it might go away or recede with time, or when the circumstances of the person's life change.