I think that'd be really cool and would make a lot of sense. I've had a bit of a hard time believing that Autumn's father was the lone voice going against the dominant culture purely out of the goodness of his heart. I feel like there has to be something more there.
Even we, as the MC, are on the path to help elves, but that's just because we've fallen for Lin. And even then we just want to treat her right. We're not going out there being an advocate. The world came and found us (Cornwall) for our message to get out. Meaning Autumn's dad took a more active role than us. Again, there's something going on there that we don't know yet.
This is why I liked the fan theory that popped up that Autumn is a half-elf, but I think Runey shot that theory down. Oh well. I'm sure he'll do something cool all the same.