I think you have an excellent point about the space available for the pygmys, red rivers and warthogs being a lot of land. Personally drives me batty that they will have rainforest animals in the savanna too but thats more of a me problem then a real problem. The pygmys are usually only paired with birds or fish, maybe primates who can get up and away if they get upset. Im not opposed to trying them with other species. The zoo though is never a fan of mixed exhibits. Forget being cutting edge and trying something new. The hogs could both be mixed with other animals but the animal plan clearly is demonstrating that they want to reduce variety not increase it. Pity.
The savannah will likely be opened up more next time its up for reno. That was the last SSP's plan and I would assume it will be the next ones too. It will be awhile though I think. If we look at what hasn't been touched either in a long time or since opening its the Domain, Indo, the Americas pavilion and the temple. The state of repair for the domain is such I would assume it will be first on tap after the new entrance. However we know sending off the tree kangaroo will be one of the first moves once things start moving again and the koala talk feels like it needs to happen soon or the Aussies could close down exports again. That makes me feel like they would look to Australasia first. It's conversion for indoor space for koalas, roos and wallabies could probably be achieved fairly easily and cheaply compared to a lot of other projects. Those are the two I think would follow the entrance work. The entrance looks like a 3 year project from the plans so even if Australiasia can be done at the same time as the entrance the new Canadian Wilderness will probably 2024 start and if we go based on most other projects of 2 years that puts us at 2026. And then the other 3 areas would I would assume be next in some order and then it would be time for the savanna again. I'd guess its not due until 2035-2040, assuming there will be usual gaps and delayed work. I could be wrong though if they see opening the savannah up as a quick and cheap conversion but I have my doubts.
As for adding those other species... YES PLEASE! I'll make it easy. Give the giraffes the ostriches as friends. If that doesn't work give the ostriches the the 3rd giraffe yard I never have seen them use. In the empty hippo exhibit waterbuck, sitatunga or nyala in some combo. Give the warthog exhibit to red river hogs and bongos but punch through to the wattled crane exhibit who could live with them too or move in with the wading birds in the pavilion. Use the outdoor hog yard for the pygmies. Rotate the wildebeest into the ostrich exhibit and the warthogs into the wildebeest yard. Get rid of the watusi and bring in addax and scimitar oryx and to make me even happier just give me a few gemsbok. I would also open up the kudu, rhino, zebra and eland yards but I was trying to avoid big costs. The only real conversions that would be needed is opening up the warthog yard and possibly changes to the hippo fencing to account for hoofstock. Oh and build a pool for the pygmies. I think most of these thing could be done for under $100 000 but we could easily add like 6-8 new species by rearranging what we have and removing 2 species (one of which is already slated to leave). You know what I was so reasonable about all that and saved so much money I get to have the baboon exhibit be converted for African wild dogs. My reward for being practical. Lol. I really do like you choices of species to add. If we can get the species in Canada why not? And for most of them if that means just bachelor herds who cares if it gets us the species, except addax. I have long wanted the zoo to be part of that program.