The problem with ground effect planes is that flying at 1000km/h a few meters above ground (or sea) is never going to be safe. Terrain (and even worse, sea) is

The problem with ground effect planes is that flying at 1000km/h a few meters above ground (or sea) is never going to be safe. Terrain (and even worse, sea) is unpredictable. It might make sense for the military but not for commercial passenger flights.