It's an inner city zoo, to most of the people that visit, those ARE wild animals and are just as exciting as the others. More so for many, because they get to touch and feed most of them, along with all of the training demos and educational classes they do in the building. As much as we like zoos to cater to us, we aren't the main ones visiting them.
Frankly, given your first visit was only 4-5 years ago, I don't think you can be subjective with this. Redoing each area takes several years, and given the size of the zoo, they can only do one section at once without half the place being closed. The zoo is extremely different from what it was 15-20 years ago. Those enclosures are likely emptying so that they can redo them, which is what they did with the big cats. When you have nowhere to temporarily move the animals, they need to leave before you can do anything with where they live. Now that the restaurant is open, they'll be moving on to the next phase.