Nah, I think it's a great move to be "with the times" and answer to the huge fandom and press hype by making an insignificant supporting character gay in their first appearance, in a low-stakes sequel movie that's kinda iffy on the merch sales front to begin with. It's exactly how I'd do it, if I had to put in a gay character in a Disney movie I'd start with their more actiony movies like WiR, Zootopia, BH6 (or better yet, a sequel to one of those) and not with the tralalaa true love saves the day Princess Musicals. h
The trick is that that crowd baying for queer representation are never fucking happy. See Voltron or SU fandoms. They claim that it's super important, that it's time, heteronormativity is toxic and homophobic yada yada - but then when they get their queer rep, they inevitably go ballistic because some people think it's the WRONG KIND OF GAY and toxic and harmful because reasons.
So, by making Cartoon Gadot gay and bad-ass, Disney is playing it safe. She's new and irrelevant enough to take the fall should there be backlash over how hurtful it is that of course the lesbian is a butch dyke, oh nooo the stereotypes, oh nooo the implications with Vanellope being attracted to her, this is pedophilia. She can never be heard of again while also simultaneously being the landmark first queer character voiced by Wonder Woman, ta-daa, and can also be used as an example on why queer characters in Disney movies are a shit idea.
And, if against all odds she's universally loved and embraced as the long-awaited queer rep in Disney, they can happily reap all the positive publicity brownie points and hype her up as much as they can, which will dilute down the upcoming disappointment over Elsa not being gay despite all the hashtag tweets in Frozen 2.
It's a really clever pre-emptive strike from Disney. If there hadn't been a lesbian character in this movie, the make-Elsa-gay hype would've continued unchecked and there'd have been a serious backlash.