That is not how the decision process works though. It is all to do with sponsors for the nations involved.
Brazil is coming because the corporate sponsors are lined up, deals already being put together. However it seems unlikely there will be any kind of ride there when it opens.
Whether the next nation is Spain, which is one of the possibilities, doesn't depend on any film in the works. Primarily they need corporate sponsors willing to invest. I'm sure there will be decisions made as to which nations they want to actively pursue sponsorship from, maybe to do with widening geographical representation, but ultimately the nations selected will be those where Disney are able to finalise deals.
Countries like India, Greece, Egypt could all be on a short list along with others. Which actually gets developed is anyone's guess just now.