Recently publicized efforts in animal cloning may also prove to be beneficial in the future. I think donors will increase, however, as our ability to treat more disorders with transplanted organs advances, the need will expand. The net effect will be an ever rising gap between availability and demand. Therefore, advancing the frontiers of science using artificial organs, or animal organs is essential. Artificial organs do not require immune suppressing drugs, but have other problems, while animal organs are a immune nightmare because they are so different from human organs.
Rejection is currently inevitable despite our best drugs.
However the number of organs from these sources is practically unlimited. You can either build as many as you need or grow as many animals as you need. While some exciting research has occurred recently, it will still be probably 10 years before such technology becomes useable. Like Jan Anderson, I too, doubt whether there will either be a significant increase in human organ donation anytime soon, or whether in the foreseeable future we can expect to come closer to the goal of offering a transplant to much a larger number of suitable patients with organ failure than we currently do. The reasons for this are multiple and complex.