I think the angle on this is not how one can get AIDS or that one could get AIDS, but more of the lines of What AIDS is, and that people with AIDS can live normal, productive lives. That's what I think, anyway.
But Seriously, I agree with a lot of you. It shouldn't be a muppet, but rather a human on the street. Muppets, as said before are immortal, like most cartoon characters. No one would like to see a cartoon about Bugs Bunny getting cancer, or Mickey Mouse with HIV.
And will this lead to more somber moments on the show? Will it lead to more unhappy truths in other co-productions? I just have this strange thought running around in my head about Rechov Sumsum (the Middle Eastern Co-production) Will this lead to stories about Jewish families who lost loved ones when an Islamic miliant blows himself up on a bus, or when a Palistinian family's house is destroied (and members killed) by Israeli tanks? I severely doubt it, but it's what happens.
Sesame isn't so much about reality reality (for further coment, I suggest stopping by a library or Bookstore and look for a copy of Mad about the 70's for a satire called Reality Street), as much as a child's view of the neighborhood. The only real somber/ serious moments on the show were Hooper's death, two Hurricanes, and the small fire at Hooper's store. Mainly, the only real problems they face are Cookie Monster losing cookies, or Grover not being able to get something right. After all, it's mainly for kids, so things have to be lighter.
So I say, introduce a human with the disease, let him stay on the show for a year or two, and have him move somewhere else before something bad happens.
I have no idea whose side I'm on here!