I guess it would only make the queues worse - each train can hold 4 people and they can only have about 6 on the track at once... 24 people on the ride at once!! Not exactly Pirates of the Caribbean throughput, is it?
People are getting worried about the capacity of DL's subs, but Turtle Twister seems far far worse to me. It looks like it'll be a fun ride, but it seems so badly Imagineered from a capacity point of view. A ride with potentially the same popularity as Big Thunder Mountain yet with less than 1/4 the capacity... ouch.
Edit: Then again, maybe it's well Imagineered for the park. It's sure to have Peter Pan's Flight-style queues where it reaches 120mins and doesn't move for the rest of the day, and if people are in a queue then they're spending longer in the park, right? The small size of the queue line on the leaked plans was a bit weird though...