Your one and only problem in making this will be populating it. How will you fill it with data and/or get others to do so? It's not valuable until there's content.
You should pursue this idea if and only if you have a solid understanding of how you'll accomplish this, and why it will work. Just making this and dumping this on the app store will not work.
You should pursue this idea if and only if you have a solid understanding of how you'll accomplish this, and why it will work. Just making this and dumping this on the app store will not work.