Re: Star Trek III - The [Speculation Begins] (Spoilers)
Or they could do something very different, (or fabulous, depending how you look at it) and have a gay person in the next one. That doesn't mean it has to be Sulu or even have that person have a love interest.
"With the first link, the chain is forged. The first speech censored, the first thought forbidden, the first freedom denied, chains us all irrevocably." ~ Captain Picard - "The Drumhead", Star Trek: The Next Generation