I think that the problem with the swinging cars is that the turns are all banked like a normal roller coaster. If they made the track flat then you'd get the swing but, at that point, it'd just be really weird. I think that if they just rebuild the cars and dump the swinging bit then there'd be more room for people to sit in the cars and I don't think that the effect would be missed. The swinging, while sounding good on paper, really doesn't pan out in practice.
I think that another problem they had was that this is a roller coaster island. If you look at other rides, they're usually on the edge of the park and thus most of the ride is outside the train tracks and off in a warehouse. Pirates and Splash Mountain show this. Splash mountain is multi-teired which ends up giving you a lot more ride for the space.
Where 7DMT is, there just wasn't a lot that they could do. Even if the track snuck underground to another building to give you more of a show, that'd be a weird, flat, straight portion of track to deal with (yellow being the track and the blue box being some building to house more of the show):
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7DMT is a great little centerpiece to Fantasyland, it's just too short of a ride.
Splash Mountain, conversely, keeps giving you more Song of the South scenes and details. It's quite thorough. Same with BTMRR.
One odd one: The Goofy's Glider, or whatever it's called now, in the back of Fantasyland. No one ever talks about it. It's been there for years (just looked it up - opened in 1996). I can't imagine anyone seeking it out. It's in a really odd location. I'm sure someone will chime in with, "My kid loves that coaster!" but, really, it's an odd duck.