If Aquaman is good it will do fine. As bad as the first week numbers are they can still recover without a reboot. Just concentrate on the origin one off movies they already have planned. Make them good movies first instead of worrying about the $ aspect. If they can string together 4 to 5 good movies in a row. They can look toward team ups or another JL movie.
JL did nothing to get us hype for Aquaman. They really screwed the pooch.