I think there needs to be more thought and research put into validating that your app idea is worthwhile. There have been traditional means of finding your market and using surveys or engagement to get a good feeling of whether or not people will actually want your product.

I make side-project apps all the time, but I'm aware that they are basically just scratching some itch I had. If you go into it expecting to make the big-bucks without doing market research and not having a marketing budget, you're going to have a bad time.