An ideal scenario would be for tanya to be given another opportunity to rear a calf (for her to rear a female would be fantastic) and the bull moved on to allow a multi-generational unit to have access to the full complex. If this situation occurred there would still exist a facility for any future visiting bull, for when any female calves mature or if any further cows were acquired. If tembo was moved on, I would be very surprised if this involved any financial transaction outside of transport costs.
However, I suspect the surplus of bulls in the captive population might mean that any institution with a facility that can hold a bull, will.