I'm guessing the question we're focusing on is "What do you want in PZ2 at launch?", rather than "What do we want from PZ2 as a whole?"
It really feels like it should be a separate thread for returning animals, given they all eventually will come back based on JWE2, and there's the fact people are after remodels, which seem logically more likely the later we get them, which is going to influence that decision.
Strawpolls for every animal with the options "Needs a Remodel", "Remodel preferred" & "Perfectly fine" is probably the easiest way to tackle remodels. They don't seem to expire either, I've got strawpolls from 4 years ago that you can still contribute to, like this one.
https://strawpoll.com/5hzddb13
You could also go for strawpolls on rating the value of returning species into "Essential for base game" & "Can return in DLC".
The problem with strawpolls is accuracy, they do claim to check IP address, and prevent VPN users from voting, but I would think it's not that hard to contribute multiple times to strawpolls if you're really keen, and getting people to leave an opinion on everything is a bit much to ask. There's also the fact such a thread would get buried, courtesy of nobody posting lists, so the OP would need to do a regular update post.
I'm thinking I'd be happy to do the strawpoll version of things, we'll find out if there turns out to be a link limit.