Sorry, your assumptions are way off. Indoor mapping and specifically location aware indoor mapping is huge. We're trying to solve exactly this problem in Londo

Sorry, your assumptions are way off. Indoor mapping and specifically location aware indoor mapping is huge. We're trying to solve exactly this problem in London, why you may ask? When you have millions of commuters using your network each day (Underground) and many of your stations are at 100% capacity then your only option is to manage the flow of passengers more efficiently. You've also missed a key problem, accessibility. The sheer volume of tourists, elderly or parents with prams getting onto a carriage thats inefficient to their travel results in exacerbating delays on platforms, this example(and other technologies) is a possible way to reduce those problems.