That is a great thing to make sure you have in your business plan, that your business will be built around those real customer wants. Do not make callous assumptions, or statements like "I know what people want", "People are going to love this", and so on. Have you done your research? Do you really know that the people you will be targeting want your product / service, and crucially do they want it AT THE PRICE that you will be offering it at? Whilst confidence in your plan is fantastic, you must make sure that it does not lead you down a blind alley along a path that is not desired by your target market. Don't assume what customers want, do your research and make sure that is clear from the start in your business plan.
So, what would your business look like over the next 10 years to give you that? Could you build a plan that would show exactly how your business could do that? It would show what your sales, fixed expenses, material cost, labor cost, and variable expenses would need to be. It should also show you how many customers you would need and would show you what your profit and profit margins would be each year. All it takes is your current business numbers as we listed earlier and you can make a business plan as many years out as you like.