I wouldn't worry about that. If the fans got mad at us casting non-white actors as elves, we could just call them racists and they'd be embarrassed out of the conversation.
Except that whitewashing in casting (particularly in blockbuster films) is definitely a thing. Casting directors frequently are very explicit about what physical body type they want for a role...and that includes skin tone. Which would be fine, if they were just specifying what was needed, but it typically has been used to alter whatever the characters are to something more....white. Need someone to play an Asian character? This white actor in makeup will be perfect! Or, you know, let's alter the story to explain why our white main character is the lead role in a film that takes place in *any place in the world.* Not surprisingly, actual actors from those places get a bit frustrated with this state of affairs. And there is a continued assumption on the part of studios that a film will not do well at the box office unless you have a famous white actor in the lead role.
So when you cast Benedict Cumberbatch, a pasty white British guy, as a character named 'Khan Noonien Singh' to recreate a role originally played by the Mexican actor Ricardo Montalban in Star Trek, a franchise known for its let's-represent-all-people-on-earth-as-one-federation...people do tend to react with a REALLY?! And yet the film makes money, so they have no motivation to behave differently. And if they do go off script, and say cast a black girl as little orphan Annie, the internet loses its mind and acts like this is the end of the world. The casting directors aren't wrong when they decide what audiences will or will not like. And it's why an actor like Antonio Banderas or Omar Shariff could play almost any ethnicity that was 'vaguely maybe not from America' (and why Montalban got the role obviously intended to be Indian in the first place).
We don't have to 'fix' any of that in this project - for one thing, this is not the real world, so even if we do cast people who don't usually get a chance to audition for these roles....it's all fake, so we're not changing anything.
But it does mean that when we gravitate strongly towards a mostly white cast for the elves, people are going to notice and compare us to studios that do this quite intentionally. We have a story specific reason why we're doing this, and the show is set in 'fantasy Northern Europe'. I think it's a defensible choice. But, it keeps coming up, and it obviously doesn't sit well with some people, and it's a frustrating situation.