Actual answer, without getting too specific: Energy needed something new. It is way past its sell by date, more money than worth it to put into new AA's and projectors and FX and the amount of stuff in there that is now due to be replaced, especially when you know it needs either a new attraction or a complete update. Satisfaction ratings aren't great and daily numbers aren't near what they once were. There are blue sky concepts proposed by WDI based on a number of factors: IPs other divisions have asked to get into the parks. IPs the parks want to capitalize on. Ideas WDI has to incorporate into the parks. Ideas Creative Entertainment has to incorporate into the parks. Ideas executive management has to incorporate into the park. Etc, etc. The ideas may be specific to a park or an attraction within a park or a land within a park or World or Land or they may just be an idea that then gets floated by various execs involved. The concept or concepts are narrowed via all the relevant parties, then WDI gets to work. Other times WDI proposes what they want to do from the start, then the parks management give feedback, then WDI goes to work.
In the case of Epcot and FW, WDI has been working a master plan in coordination with TDO and Epcot's management that included Energy. Would they put up a fight? No. They would have questions and concerns that needed to be addressed through the process. They tend to defer to the creative team that's led by the guy who was on the original Epcot team. That team is going to put the best attraction they can in there, and the management groups all know that. Believe it or not, they look forward to new attractions as much as everyone else. We don't get to redo major attractions all that often. Whether they personally agree with the request to incorporate an IP or not, they are excited for something new. There were multiple ideas for Energy, and everyone signed off on the attraction that is planned. Disney runs by committee more than most realize, and there's a lot of factors that get considered in all of these decisions. So, plans considered. Meetings had. Ideas discussed. Some execs liked certain ideas over others, but this is the idea that was greenlit. Safe to say everyone is happy to have something new in there.