This idea of virtual zoos came up in a debate I assisted some years ago, about whether or not zoos should exist. The anti-zoo spokesman proposed this idea, and the main arguments against it were that people would miss seeing real animals, but the anti-zoo crowd then accused them of anthropocentrism.
Another strong argument was that people are addicted to touch screens enough as it is, and this is pretty much like playing with a giant tablet. The woman who said that pointed out that the last time she visited the Aquarium, kids were "widening the image" on the glass of fish tanks!

The spokesman said that, that way, people would experience "real animals, not animal bodies with artificial behaviors." But really, how "real" is a screen showing an animal documentary? :/
I must say that the spokesman from Barcelona Zoo didn't do a great job, basing the fact that there are elephants there by saying "there have always been elephants in the Zoo." I think I intervened, saying that while the zoo is important for conservation, there's nothing wrong in leaving Elephants off your collection, if you can't afford them.
In the end, it's all about being reasonable; we need zoos, that's a given, but they must be built with intelligence, in design, collection and image.