But people still die.

I think a major part of how our instinctive morality works (and a reason humans, as a species, have been so successful) is that we don't go for cheap solutions. The most moral thing is to save everyone. The solution here is a stopgap that just diminishes the urgency of technology to grow organ replacements, and even if short-term consequentially it leaves more people alive, it in fact worsens out long-term life expectancy by not addressing the problem (which is that people's organs get damaged or wear out).

If a train is heading for 5 people, and you can press a switch to make it hit 1 person, the best moral decision is "I will find a way to save them all!" Even if you don't find that solution, at least you were looking!