I really dislike that excuse to be honest. That's how Tera got away with the Elin race *shivers*. Thankfully they made it so Lalafells aren't an oversexualized child-like race at all in this game. They just look like cute potatoes.
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As far as new races go, I wouldn't mind Viera. Then again I've accepted the likelihood we'll ever get a race that is anything other than, "A human with <animal parts> slapped on," as incredibly unlikely.
I honestly couldn't come up with something else from the series off the top of my head. That and the Return to Ivalice stuff is convenient.