ETA: There is now a third thread, so send new comments there.
Since the first thread has exceeded 500 comments, it seems time for a new one, with Eliezer's just-posted Chapter 33 & 34 to kick things off.
From previous post:
Spoiler Warning: this thread contains unrot13'd spoilers for Harry Potter and the Methods of Rationality up to the current chapter and for the original Harry Potter series. Please continue to use rot13 for spoilers to other works of fiction, or if you have insider knowledge of future chapters of Harry Potter and the Methods of Rationality.
A suggestion: mention at the top of your comment which chapter you're commenting on, or what chapter you're up to, so that people can understand the context of your comment even after more chapters have been posted. This can also help people avoid reading spoilers for a new chapter before they realize that there is a new chapter.
Just occurred to me: if magic ability is genetic, it should in theory be possible to use gene therapy/retroviruses/etc. (and perhaps some magic) to make all the Muggles into wizards! (Or at least all the ones yet to be conceived or something.) I can just imagine Harry creating a Plague of Magic.
No! It was pointed out how a wizard has to study hard before doing magic. So magic enabled Muggles would be rather useless or dangerous. No way to raise an army. (Also he would have to be accepted as the leader of an Muggle group)
More interesting is the opposite way, of removing the magic gene or disabling it. A vaccine against magic.