If we use Ekundu's enclosure and the current lower half of the elephant enclosure that would theoretically give them two additional exhibits. With that in mind, I'd imagine the two current exhibits would (and should) be combined. Considering the close proximity the off display yards could very well be at the upper half of that said elephant paddock as it's a fair amount of land space as seen in this photo:
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That’s more than enough space for two Pygmy hippopotamus exhibits, with the addition of off display yards and supporting infrastructure (filtration pumps etc). I agree the two existing exhibits should be combined. They’d otherwise looked outdated and cramped next to the new exhibits; and having three spacious exhibits is better future proofing against evolving exhibit standards.
The above would allow Taronga to accomodate at least three adults (and young) across the on display exhibits; with off display yards further extending this capacity.