While a dope idea, the number of bending is the important factor. Depending on the material of the screen, that's a pretty low safety factor for something that is gonna be constantly bending. That 200,000 is a life cycle of the glass. That number could be lower.
Being a mechanical engineer, I deal with a lot of materials. Each material has it's own set of material properties and if any heat treatments is applied which would affect strength, hardness etc.
The phone has its most important weakness where it actually bends. Once it's bent those amount of times depending on how a person uses it then you start to deform the material. Bend radius, elongation, tensile strength are important factors.
Best way to explain is a rubberband which is considered as an elastic or the proper term elasticity. If you bend a rubberband a certain amount of times outside of its normal state it doesn't go back to it's original state. It's deformed and has went past its elasticity stage.
That's just a rubberband. Imagine a glass screen.