As is often heard, necessity is the mother of invention. Most of these niche ideas come from people that are active in whatever space the nice product serves and yet has no product. It takes the timing of someone with the need && the know-how of how to make the product. Just having the need for a product part of the equation. Having someone recognize what the solution would be, the time available to create that solution, and an overall understanding if the effort would be worth it all aligning.