Would this change affect me, or impact my experience in a meaningful way? No.
But it seems it could be beneficial to other players.
I don't know how much harder it could be to implement it going forward, though backwards compatibility could potentially be a nightmare depending on how exactly dialogue and cut-scenes 'decide' which pronouns to use.
Hypothetically, the easiest path for them would be getting rid of all gendered pronouns and making all future dialogue referring to the WoL into "they", plenty of games (singleplayer or online) already do this - I personally wouldn't be a fan of it, but it wouldn't ruin my experience either.
As for the extra customization options, I don't see why anyone would be against more options.
I'll lend my support, but realistically I wouldn't expect this feature to happen any time soon, if at all.