I don't believe there's such a thing as a healthy plant-based diet. That's just me speculating though, nobody even knows what a healthy diet is.

From a nutritional perspective however, animals can do things for us that we can't even do in the lab, let alone at industrial scale.

It might be possible to create some sort of fortified plant-based diet that has all the nutrients in a form that the body can actually absorb, but even then, that doesn't mean this is the route free people will go.

Even if you could change western food culture to make people to stop eating animal-based-food in favor of that plant-based Frankenfood, you will not change the food culture of rest of the world, which is shaking its head at white saviorism.