As I explained previously, this section is a nice to have, but not a requirement. If the customer talks about an interesting upcoming project that will involve your product, then go ahead and include it. If they give a verbal shrug and say they can’t really think of anything, that’s okay; just leave it out.
Do you want to see examples of each paragraph of the structure and how they come together? Check out DIY Case Studies: A Drop-Dead Simple Guide to Writing Killer Marketing Case Studies for a complete sample case study that lays it all out.