I was gonna say "nah, let's just plan to cut off acceptance once we hit 26 different classifications of people."* But then I remembered seeing LGBTIQ2S, where 2S denotes people who identify as two-spirit... so we're already up to letter pairs. More soup!
I'd love to see the day that we can drop L, G, and B, as sexuality is increasingly a non-issue, and as those classifications stop making sense in an increasingly nonbinary world.
I'd support SGRS (sugars?) to denote sex, gender, sexuality, and romance. I bet I forgot something, though. More soup!
But me, I identify as transgender and pansexual, so I think that queer would fit just fine, except that "pansexual" means "lacking hangups" in my mind... straight people are the weird ones!
* to be a smartass, let's be clear.