Also on the topic of what's replacing the elephants, it's still very much in the air, although to my understanding Melbourne will be moving away from large ungulates overall (of course, with the exception of Giraffe and Zebra).
I'm not sure what exactly they have in plan (although it's most likely been decided).
I'm backflipping on my previous stance regarding this situation. I visit both Werribee and Melbourne often and know a few of the keepers. They believe that if Indian Rhinos were to be kept by Zoos Victoria, they'd be kept at Werribee. Werribee has the space to breed this species, unlike Melbourne who (with limited space) will probably be looking to reinvest the space into smaller, rainforest species.
It's still unknown yet what will replace the elephants, those are just my thoughts.
I genuinely don't have a single outstanding idea of what will, so it'll be interesting to see what they finally decide.