Maybe not all but atleast 8-12 more should be completly reasonable, afterall we skipped a pack for the artists to work on more or less.I almost don't dare to say it, but it still would be a lot of work for the artist (we got a TON of animals by now) and presumably cost for Frontier, so the only way I really could see ALL animals get those signs is with AI. And I really don't know if I want to go there...
But yeah, having those signs would be nice. I gave up hope for my beloved Professor Wurst food stall.
Also something that imo should be completly reasonable are the flexicolor sillohete ones.
They all seem to be traced from a stock pic on google so theres no reason why they couldnt make more as its just a flexicolor outline of an animal and would be imo completly reasonable to fill up atleast a good part of the large missing signs gang from the basegame