Hawaii hasn't been able to get them off of one island so... No

Rhinos aren't super useful.

Being super useful has a few requirements. Elephants, for instance, are incredibly useful. They're large, they carry burdens well, they can be trained and will behave well if they're treated well, they're social and understand commands.

But they have one baby every 22 months and it takes years before they're fertile. So they're not super useful. Rhinos, similarly, do not reproduce fast enough to check off the super box.

I'm on a strict enough diet already for medical reasons, trying to get that to work without animal products would be a nightmare I don't think I can deal with.

To be clear, I don't think that's going to happen. Like I appreciate what the near meat movement is doing, I'll grant you the conditions these animals live in isn't good and there's a debate to be had about the ethicality of raising livestock at all, let alone the way we currently do it.

We can't even move away from corn syrup which is causing the largest health crisis in history because a small section of the Midwest can't grow much else but corn. You think we're going to let the entire meat industry crumble for some vat grown goo I've got a bridge to sell you.

That said, let's say that yes, meat loses popularity for whatever reason and the industry crumbles. 90 billion cattle and 70 billion chickens become useless what happens to them?

In short, saving a few specimens on small farms, extinction. These animals will die, the cattle will die in childbirth or starve. The chickens simply won't be able to sustain themselves, and will succumb to disease and the fucking awful effects of how horribly inbred these animals are.

When their usefulness to humans ends, their one survival advantage goes with it. And so, you've supported my point. Usefulness to humans is the best survival advantage a species can have. They just only get that advantage while they're useful.