Not quite a magic pill, but...
Just a couple of thoughts about the magic pill idea.
First, I think I would take the pill. Having the immediate mastery for whatever it's worth wouldn't keep me from continuing to practice. It seems like improvement is always possible.
Second, this is pretty much the concept in the science fiction book "Helm" by Steven Gould. This story is what turned me on to the idea of learning and practicing aikido. If you read the story you will note that the so-called magic pill doesn't quite mean immediate mastery.
Anyway, I liked the story a lot and I'm interested to find out what other aikidoka think of it.