I've learned long ago to never second guess Blizzard on the complexity of a "fix" for anything that goes awry in this game. There are innumerable "how hard can it be" bugs that show up that, evidently, are hard to fix. The ripple affects seem to carry to all sorts of unintended consequences. And there have been uncountable bugs where you go "How the heck did they manifest that after this patch?"

I remember the Blood Plague, I was there when it happened. I distinctly recall someone in front of the Ironforge Auction House calling out "everyone come to me, it's better when we get close". Which, of course, it's not. It's a bad idea. But it was his idea of a good time. The solution was to abandon the cities. But there were always folks who enjoyed spreading the plague. And, honestly, that never bothered me. It IS fun. It was a fun encounter, and certainly fun in terms of the whole dynamic going on, appreciating what a novel "World Event" it became.

World Events is WoW have almost always led to disaster, so we don't get them anymore. The game simply doesn't handle huge volumes of players in a single area well. Their last big try was the Gate Opening that turned the Silithus zone into a slide show for most of the day. But as a player, it was still a great, epic experience, because you know it will never happen again. In a game of continual routine, outliers are always fun.

The Blood Plague was a novel event, it made the World more "alive". I'm glad I was there to see it and be part of it. Just one of those things the makes WoW history even richer.