I would prefer the exhibit do be demolished completely and replaced with something else completely. This would be a good time for meerkats to make their return, even though many zoochatters would consider it a waste of space. A kopje exhibit with meerkats, klipspringers and maybe other species would interesting.
It's nice to see the zoo acknowledged the species and last individual at least, particularly given Dall Sheep are a species that aren't often acknowledged this way.