Some thoughts:
One trend will be wild animals living in transformed landscape with high human density, because truly wild habitat is too small to accomodate them. This is seen in India, and quickly becomes the reality in Europe and USA.
Zoos they consider in isolation, while they are part of wide world. For example, isn't it a folly to care about welfare of zoo elephants and apes, when wild elephants and apes are slaughtered en masse?
Techno-zoos, virtual zoos, internet application in zoos etc. are overblown trend. It goes against the desire of authenticity in seeing animals. And, indeed, internet and virtual experiences are best consumed at home, without visiting a zoo or indeed, without the need of live animals actually existing. It is theoretically possible outcome that all wild animals are extinct, but people enjoy everyday beautiful computer-generated wildlife films and simulations.
Economic split between relatively poor majority and very rich minority can create two kinds of zoos. There will be zoos for masses, where low cost is a major factor, and elite zoos costing $100-$200 to visit, where probably one can pet and feed animals, have personal zoologist guide etc.
Some expensive zoo visions likely will never happen, because of economic growth will not support them. There may exist technology to clone extinct animals, but no resources to actualy do it.