For my understanding I made a chart from "ZetaTalk: Transformation" shown below.
Note: written by Jul 15, 1995
What is the Transformation? The Earth is undergoing a subtle transformation, as the Transformation is now. This Transformation has been progressing for at least this century, and will go for at least a century more. Transformations occur for many reasons. One reason is that the great majority of the entities native to the planet have reached an orientation decision, and are ready to proceed with other lessons, and 3rd Density planets are checked periodically as to their readiness for harvest in this regard. Another reason is administrative, and that is why the Earth is undergoing its Transformation now. The majority of those on Earth have not yet reached their orientation decision, but will be moved to another planet, as the Earth has been designated as a future home for Service-to-Other oriented entities. The coming pole shift will expedite this process simply by the fact that 90% of the populace will die, either during the shift or shortly thereafter.
To qualify for Service-to-Other orientation, an entity must consider others as often as the self. To qualify for Service-to-Self, the entity must focus on the self 95% of the time, almost exclusively. Where it may seem that these individuals would stand out, some very diplomatic and cultured people are of this category. They are able to disguise their self interest in condescension to others. They are able to disguise their self interest as the interests of the other. During 3rd Density, entities must decide their spiritual orientations - Service-to-Self or Service-to-Others. Most, the vast majority, decide the latter on almost all 3rd Density worlds. This decision, or the lesson of 3rd Density as it is called, needs to precede almost all other lessons, as mixing the two spiritual orientations together creates chaos and thus other lessons cannot proceed. Many humans on Earth are choosing the Service-to-Other orientation, and mid-incarnation are thus joining the ranks of the Service-to-Others. This occurred in the past as well.
The world involves an increasing separation, by orientation, as the Transformation proceeds. The mix of Service-to-Other and Service-to-Self, and the proportion of undecided, will not change much as the cataclysms near and times get tough. Where some of the undecided will rise to the challenge and move into the Service-to-Others category, there will be others, operating in the Service-to-Other mode when things are comfortable, who will find their self focus increasing as their insecurities increase. Some, a very few, who are operating in the Service-to-Self mode, will find the troubled times pulling at their hearts, and will move back into the undecided category. A greater number will find their selfish nature accentuating during difficult times, and like those on the Titanic, will push all others aside to save themselves. They will move into the Service-to-Self category. So you see that the numbers will move about a bit, but essentially remain unchanged.