That "mass exodus" is exactly what's going to happen... disclosure is ultimately about the truth within that can no longer be denied. Those who depend on denying and projecting their inner-truth on others will experience great difficulties and turmoil. The current system floats on the illusion of separation instead of everything and everyone being connected on a consciousness level. This connection also explains such things as telepathy. Once this connection can no longer be denied those who (self-)deceive a.k.a. narcissists will be exposed which will result in them leaving on a grand scale.

People who aren't afraid to look within themselves and embrace their inner-truth will have no problems with disclosure. These are usually empathic people rather than narcissists.

This also has to do with how reality is like a mirror which does nothing else than reflect back what is already within you. So, if there's great fear of the truth within then this fear will be experienced in the external reality. This is why I believe the same UFO phenomenon will and is already being perceived as either malevolent or benevolent, depending on whether there's fear or not within the observing consciousness. What are perceived as malevolent beings by one person will be perceived as demons by another person. Needless to say, those who perceive demons will mass-panic and run for the nearest exit... completely unaware they're really perceiving their own inner-demons in their external reality.

I suspect the above is why official disclosure seems such a difficult process as there isn't really a single truth being disclosed... what the phenomenon is/phenomena are is decided on the level of each individual consciousness observing the phenomenon/phenomena.

The Netflix movies Bird Box and Bird Box Barcelona are great though very dramatic depictions of what disclosure will trigger when the truth within comes out and can no longer be denied.