Take this seriously!
Roger Rabbit's Cartoon Spin was closed for over a year after a little boy fell out and died due to inadequate restraints, which to me means moronic parent sitting next to this kid who was failing to discourage this little one from standing in his seat.
The "Benny The Cab" cars on this ride were apparently re-done with improved restraints and, for some reason, it took them a looooooong time to re-do the ride. Didn't help that Disney was being sued up the sphincter by the family of the deseased with rabid lawyers chomping at the bit to get a huge pay-day out of the conglomorate.
Not that Disney isn't partially at fault, but how much is too much? Yes, Splash Mountain offers no seatbelt. Question is, how hard is it to actually install a seatbelt? Shouldn't take long.
The problem is, can they ever figure out a way to ensure that someone won't deliberately slip out of said seatbelt just to be a jerk? I know rides like Star Tours have a system that won't let the ride operate unless all seatbelts are fastened. I would assume that it's next to impossible without a total big $$ rehab to install a similar system on a somewhat free floating ride like Splash Mountain.
And mark my words, Pirates of the Caribbean, It's A Small World, and Living With The Land are next! 'Cause, after all, if I wanted to take a dive from those boats, who's gonna stop me?