It's just another business/service niche that is solved until the current Big Provider becomes Evil or goes under.

Similar to "made for everyone" social networks and video upload platforms.

But there are niches that are trip planning + there are no one solving the pain! For example Geocaching. I always dreamed about an easy way to plan Geocaching routes to travel and find interesting caches on the way. Currently you gotta filter them out and then eyeball the map what seems to be nearby, despite there, maybe, not being any real roads there, or the cache is probably maybe actually lost or has to be accessed at specific time of day.

So... No one wants apps that are already solved + boring.