@Xenarthra The Pygmy Hippo SSP is slated to expand rapidly in the coming years if breeding is able to fill new exhibits. The below document from last year states 9 institutions that are building new exhibits in the coming 3-5 years. These include Greensboro Science Center and Tulsa Zoo. Wildlife World Zoo and Metro Richmond have just added the species as well.
https://static1.squarespace.com/sta...0f84/1558353121507/2019+-+WPPH+TAG+Update.pdf
This was a great little read, thanks for sharing! The new goal of 4 female common hippos per breeding group might herald the needed change for a lot of zoos and pygmy hippos then. Motivation to consolidate females when possible + all of the older/smaller housing suitable only for a pair being unusable + desires for lower cost/maintenance, might cause a big shift in where common hippos are exhibited. Not fantastic for folks who love them, but it's a big opening that the pygmy species could fill.
One thing I'd be interested to see is if pygmy hippos can fill the gap as an "anchor" species like their cousins. I think they're charismatic enough, but I can see zoos being reluctant to phase out an ABC species like hippos if the replacement is viewed as supporting cast for gorillas in a Congo section.