yes it has been discussed many times. But we are not zoo administrators and do not make the decisions. I can tell you that you can watch the European zoos. USA slowly follows their management style. For example s bachelor group along a breeding group similar to emmen.
many zoos are landlocked and unable to take a group of bull elephants such as Memphis. It’s a postage stamp sized exhibit as well with too many cows on site for example. Some zoos plan to phase out. Elephants are expensive! Plus they can be difficult at times to manage.
There are some American zoos that currently keep geriatric elephants in more newer spacious habitats that centrainly have the space to take in either bachelor, multigenerational groups or both. Here's some I've read that can do that with little to no renovations:
● Atlanta
●Audubon (they have a new exhibit and should be bull proof for bachelors)
●Bronx (if they plan new exhibit in the future)
● Busch Gardens Tampa ( I read they kept a bull there for a few years)
●Cheyenne Mountain
●Cleveland Metroparks
● Jacksonville (the next phase of their master plan looks to upgrade the elephant space as well as move the lions to a new habitat.)
● Los Angeles
●Maryland
●Memphis (their first phase of their new master plan is to make a new complex)
● Miami (both asian and african)
●Milwaukee (they can already manage bulls)
● Rodger Williams ( I'm very unsure if they will hold ellies long term).
●Tulsa
Point is that it may not be necessary to make a completely new bachelor habitat from scratch at the moment. I know the brookfield and san antonio zoos are adamant they will built new elephant habitats in the near future once they finalize their current projects. Louisville has also said they will look into making a modern elephant space once they send their two elephants to the elephant sanctuary this summer. And hopefully knoxville, nashville, little rock, hogle, riverbanks, and phoenix can eventually fundraise to build spacious elephant complexes.