What would you suggest that they do? If I remember correctly, the elephant barn is actually a multi-species barn, sharing with at least the rhino(s). So they may not tear all that down, but they could renovate the space. They are already set up for protected contact.
So it is a massive building that houses elephants, rhinos, and tigers with some additional space for hoofstock I believe. But the rest of the barn is like half the height of the elephant section, so any expansion wouldn’t be able to use this area. Over time some small renovations have been made for protected contact as you said, as well as 2 of the stalls having sand, and converting one stall into a restraint device.
Renovation of the building to create a new elephant exhibit though would mean renovating a 45 year old building. Its functional lifespan just like the rest of the complex and the monorail itself is probably not long. So my plan would be let Patti and Happy live out there lives here. After that just have a second rhino exhibit and allow an expansion to the breeding program for them. I mean the monorail may be able to make it to 2030, but beyond that probably not. After that the zoo will be faced with a decision about what to do with the asian complex. Thats a bit down the road hopefully though.
I honestly think the WCS and Bronx Zoo should focus on there other plans (which are largely not public and only been hinted at), once they are back on there feet post covid. I don’t think elephants should be at the top of there bucket list imo. I know many disagree with that though.