First of all, welcome to the forums side of things, glad to have you here with us. Secondly, I really enjoy seeing other's suggestions for the game, and I know other users do too, so thanks for sharing!
Now that the source code is available for use I believe what you've suggested is not out of the realm of possibility, just depends on what Raz and the other staff have planned and what kind of vision they have for the future of the game. I think the only reason I'd be hesitant in agreeing with this idea is the fact that FeralHeart has always been the feline and canine models. It would be a considerably large change to how the game has been for the past almost 10 years, and others don't always respond well to change, as we've seen in the past. Change is inevitable, yes, but there's a lot of pros and cons to the decision.
We also have to keep in mind that these things can't just be thrown into the game over night if a decision was made. It takes a lot of time and effort to create things such as new models, and they'd probably have to first find users such as concept artists (would be a wise choice so they could have a blueprint of the models to go off) and content creators to join the development team, and then proceed with the project which would take months, maybe even a year or two. It's a big process.
I'm not saying it's too big a task to take on, just looking at it from the creator's/staffers' point of view.
I know a lot of users would be for this idea 100% though, so you're definitely not alone in wanting new models. I'm neutral on the topic as I don't think we necessarily need new models. But in saying that, I also wouldn't be against the idea. We'll just have to wait and see what's in store for us.