When they shift their development team for their next game - which is what they're going to do - one animal a week is probably way too much to ask. I mean, it takes whole teams to make five to eight animals per quarter. There are, on average (because release dates don't line up perfectly), 12 weeks per quarter with full staffing, and not all of those staff work on the animals as one unit - you've got different people for concept art, texture, animation, modelling, research, soundboarding, and so on. So all that + 12 weeks to create at maximum seven habitat animals and one exhibit animals amounts to one animal in 1.5 weeks.
Again, with full staffing. Reduce that, and you'd be looking at, who knows, one animal per quarter, maybe?
Nobody wants support to end, but it is going to. The game can't live forever - eventually it would start running at a loss, and then the quality would drop or the price would go up, or worse, both.
Edit: Worth mentioning the financial side of things too, since we're in this thread - people sometimes talk about this game without thinking about where the money they make actually goes. If Frontier as a whole is running at a loss, it doesn't matter how profitable an individual IP is. Running at a loss impacts the whole company; they won't just cut out the parts failing, sack those staff, and pour all their resources into a four year old game that, despite still being profitable, is seeing a steady reduction in overall engagement every financial year.
One animal every so often (because a week is practically impossible even with full staffing) isn't enough to pay the bills.