They are making their own Aikido as per O'Sensei.
Who says they have a responsibility to learn?
Most people don't want to change themselves let alone the world.
Your worry too much about what other people are doing.
Your expectations of other people are too high.
Sure, it's just too bad that Aikido requires partnership to train. My partner's failures effect my training.
Many of great martial traditions, and even non-martial traditions, have seen their end in a few generations for many of the reasons discussed in this thread thus far. For anyone who loves Aikido, you can understand the frustration.