Hence why I said it needs a complete overhaul to ramp up the complete system. The current boats are rather big. Take out the sail (which blocks your view anyway) and figure in a second row and it would work. The vehicles would travel the same speed but load 4 to 6 passengers at a time rather than 2 or 3 guests at a time.
I don't think you can eliminate the sail without damaging the aesthetics of the ride.... Then again simply removing the sail might damage the aesthetics enough you wouldn't have crowding problems anymore.