I don't know, the Asari were created as space babes, kinda like Twi'leks. If they are now retconned to be a gender fluid androgyn race, that will upset a lot of people, I'm sure.
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You do realize this is a standard Bio recipe?
I believe Bio did too much of a good job with the trilogy characters. Intentional, of course and very successful. However, because many gamers made these characters their own or allowed themselves to be attached to them, any physical changes is viewed as anathema (detested). So, it's unsurprising to see such reactions.
Bio can easily explain this as a natural occurrence of their children which will disappear as adults.