come to a turning point

To arrive at a point at which some event, activity, situation, condition, etc., begins to change in a dramatic way. I agreed to have a meeting with the mayor, unaware that I was coming to a major turning point in my career. The medication is clearly not having the desired effect, so we're coming to a turning point in our treatment options. Either we try something much riskier, or else we transition the patient into palliative care. A: "After years of hard work, one of our products has become a runaway success! I think we've finally come to a turning point with the business." B: "I'd say so. Demand is far outpacing supply, and that has never happened before."