So, we cannot predict the long term, and depending on the rate of change in a system, the long term can be very short in the human time frame. To the degree that we can predict, even mathematically precise analysis cannot determine our goals for us. That is, we cannot compute our values. Becoming skilled with Bloom's taxonomy will only take us far, or expressed another way, Bloom's taxonomy cannot take us any where at all of significance until our values have been established. Yet in an intriguing conundrum, the peak of Bloom's taxonomy of higher order thinking skills is evaluation, a task that cannot be completed without a set of criteria on which to base ones decisions about the world.
Criteria represent a set of values.
Bloom's taxonomy only takes on fundamental importance when it is used to leverage a set of values. The deeper and more complex the problem, the deeper we must dig towards our most basic values. Bloom's taxonomy then mandates that we look beyond our rational skills, look to issues of faith and belief about the most important aspects of our existence. As to the question of the percentage of students that must formally address this topic, we do not know. There is no data.