My thoughts on the subject are pretty straightforward.
This is children's entertainment, directed at pre-sexual human beings. There are no "Gay, Lesbian, or Bi" kids committing suicide over a lack of rolemodels, because kids do not have these kinds of insticts yet. This is incidently part of what makes child predators so horrific... the nature of their target.
Sexual drives and orientation develop later during this thing called "puberty" and don't appear fully formed all at once. By that point people are done with things like Seseme Street, and the tween/teen media has already been handling these issues, there have been a number of high school dramas dealing with the issue of homosexuality. Heck, even "Buffy The Vampire Slayer" tackled the subject.
To be honest I'd question the motivations of anyone who wants to insert sexuality and so on into the programming of the pre-sexual. The whole "hey, let's have Burt and Ernie be a gay couple" strikes me as being something a group like NAMBLA would want as an "indoctrination" tool more than anything reasonable.
My overall attitudes about gay rights aside, this is taking things too far. We're dealing with an audience that feels the other gender has "cooties"... for crying out loud.
