I have a mental image of the world's aviation CEO's sitting behind closed doors clutching their bellies in hysterical laughter at the eagerness of pilots to take on the burden of some of their business costs.
I very much doubt that. They would be too busy worrying about their own needs and desires, and the competitive threat posed to themselves by the many other predators nipping at their heels. CEO's are rather like premier sports players, in that they see themselves as a valuable commodity with a very limited tenure.
Human nature is driven (as with much of the rest of the sentient natural world) by a competitive need for survival. Human behaviour rewards and applauds competition and it is a primary driver in how we do many things in our lives. "Morality" is parochial, in the sense that it is a set of "rights and wrongs" that is accepted by a particular group of people. One person or groups perception of "morality" can be very different from that of another person or group. Even then the perception can be set aside or altered by a threat or overriding survival need. For most of us, the basic survival needs of protecting our families and ourselves, and putting a roof over our heads, and food on the table, is further driven by the need to provide buffers of comfort that drive the threat of loss further away. Money in the bank, A bigger house, a faster car, greater perceived status, a higher position on the totem pole. They are all competitive drivers.
What would happen if no pilot ever again paid for his own type rating? and
How could we go about getting all the pilots in the world to agree to such a principal?
That is simple. You personally would see the removal of a competitive obstacle, thereby giving you a perceived advantage. After all, that is why you asked the question. That is also why in the millennia that surrounds our current state of evolution, it is never going to happen.
How could we go about getting all the pilots in the world to agree to such a principal?
I think you mean
principle, but in any event, and for the reasons proffered you couldn't. It may be enshrined in rules, beliefs, and practices, but if it provides a competitive edge to somebody else's real or perceived survival needs it will not be eliminated.