No, it's idiotic. If the character was originally written as being gay, it would be fine. retconning the character to be gay, because the actor who plays Sulu is gay in real life, is stupid and pointless, much like your entire post.on reimaging..
nobody has issues till it trips their nostalgia & identity.
id make kirk and spock gay/bi, as an adjunt to the plot, just to hear the outcries. it shouldnt make a difference. a blackspiderman, bring it on. itll ellucidate the subtle homophobia but allow for plausible deniablity. bigits wont then be able to relate vicariously with them and will be upset because menwhohavesexwithmen is something less.
making a char gay does not add character depth. it does however allow gay kids to actually to look up to the main character in a more relatable positive light. thats something i NEVER hear. and guess what?.. gay kids have always looked up to straight heroes not because they were straight but because they were heroes. it should go the other way without outcry. generally you couldnt have had gay characters back then. closest things were feminized often implied villans. an interracial kiss was taboo then. im suprised that takei wasnt moved by this -- its a really thoughtful gesture.