I think opening a quilt shop is a great idea if you are one who is willing to help the people that are starting out and have several questions and you don't get upset but willing to help. I have seen where people are treated badly or talked about when they leave a store.
Variety is great too, seems like a few shops don't have fun stuff like decorations (signs and magents, shirts) seems like people like those things also.
Good luck with whatever you plan on doing, we need more great shops.
How exciting!