I think there's a big area in-between an exhibit not as comprehensive as Africa, and an exhibit that looks to me like just tigers and a few side exhibits. I don't think anyone would expect this to be the same scale as the other two sections, however this proposal does seem to me like less of an Asia zone and more of a "here are tigers and a few other species" zone. I hope this is only "Phase One" of Asia, as the zoo certainly has room available to expand the zone and include additional species in the future (e.g. a second big cat, sloth bears, primates, ungulates, a walk-through aviary, fruit bats, gharials, etc.).
As for your comment about not wanting it to be a "two-day zoo", I know in theme park design there's one line of thought that creating more than can possibly be experienced in one day adds perceived value to visitors, and makes visitors more likely to want to return. I'd imagine some of these philosophies apply to big zoos as well. Most visitors aren't going to see the whole zoo, but that's okay. It'll only make people more likely to come back later and hopefully have a completely different experience. Furthermore, I've never seen many people on here complaining that Omaha, San Diego, or Bronx take more than a day to see everything, and I suspect many zoochatters would be thrilled to have another two-day zoo located in a completely different part of the country.