Considering Africa Rocks is going from meandering road from its previous status as steep slope,I would say it is probably possible,though I don't know if it is feasible. As for a replacement,an additional Asian area might be nice,but there's not much left uncovered by their existing Asian areas at both the zoo and Safari Park (which are intended to complement each other). Others have suggested an extended Australia/Oceania area. I'm not sure how likely that is. Fauna from Australia and NZ aren't exactly easy to come by in the zoo world. Lastly,and most likely,a California/North American themed area could go there. Those aren't currently common in California but with Oakland opening one and Los Angeles planning on one,I'd say it's a fair assumption.