This is the 64 million dollar question What has changed? why keep trimming down to the bone, how far do they trim before the public lose interest?
The interesting thing is that while the assumption is there that the public don’t care about anything that isn’t considered an enabling crowd puller; a large percentage of their paying visitors will have come from a generation that remember a zoo stocked with species. Whether it’s reliving nostalgia or simply wanting to getting their moneys worth - to what extent will these people be won over by a few modernised exhibits at the expense of a massive decrease in biodiversity? There’s a happy medium that needs to be found; and I fear some of our zoos have lost it.
As for zoos filled with playgrounds - what better way to make trying to get your kid/kids to engage with the animals a gruelling chore. It soon becomes apparent they don’t give two hoots about the animals and just want to play on the play equipment and the parents are left wondering why they didn’t just save their money and take them to the playground down the road.