The reason FNSV doesn't have the lines that IAJ did when it opened is fairly simple? IAJ was a ride that was packed with adventure and thrills, from what I know it doesn't look like Nemo is packed with adventure and thrills. HM and POTC are also packed with adventure and thrills despite not being wild rides. FNSV just doesn't sound that exciting. Now a ride like TDS's 20,000 Leagues Under the Sea sounds exciting because it looks very atmospheric and mysterious. I like the movie Finding Nemo, but by theming the subs to it, it makes the subs less appealing to me. Finding Nemo sucks the mysteriousness out of what a submarine ride should be.