What kind of fool concludes that "(they didn't)" when they obviously heavily modified the ride's blocking system. You're smarter than that. It's not like they just plugged everything in from Maelstrom and left it as is when the ride no runs two more vehicles and has a combined load/unload. The ride control system was modified to carry more boats along the course, to combine the load/unload portions, to change the timing for the block zones during the backwards portion and to modify the last show scene's block zones in order to accommodate more boats before a cascade is triggered.
The capacity is low, but it's not abysmal. 1000 an hour is WAY beyond the majority of rides in every Fantasyland across the globe including all of the "classics" that people are comparing this attraction to. Of course I'd love to see it closer to 1500 an hour, but I'm also glad it's not closer 500 an hour or below like Pan, Pooh, Snow White, Pinocchio and Alice.
For anyone upset over the length of the queue- it's a complete fallacy to equate hourly throughput with queue time. A big new ride, regardless of it's capacity, is going to dictate a 4+ hour queue on opening day and a 2+ hour queue for at least several months. The only exceptions are the capacity monsters like canal rides and omnimovers.
Think about it this way: right now Frozen can do around 1,000 an hour X 12 hours, so 12,000 riders per day under optimal conditions. Epcot averages around 30,000 visitors a day. They could double the throughput of the ride tomorrow and there are still going to be LOTS of people that don't have the opportunity to ride. Of course, it would mean more people being able to ride and I'm totally in favor of that. But to assume that the queue time would NOT be 2-3 hours right now is just ignorant. It's the reason that Soarin can now tear through 50% more people per hour yet the queue time is currently sports a 225 minute wait according to the app. If you do the math (which I'd done extensively, I'm a sucker for theme park analytics regarding capacity), there only only a few attractions across all of Disney/Universal that can accommodate the daily attendance. For the Magic Kingdom parks, the number of attractions (beyond the train and HKDL's Small World) is ZERO. The vast majority can't even do half of the daily attendance.
Go throughout the Disney/Universal chain and look at capacities vs queue lengths- there's really no correlation. Unviersal's Studio Tour in Hollywood is the highest capacity "attraction" besides transport at any park across the globe and it commonly garners 2-3 hour waits. 99% of the public is completely oblivious to hourly throughput anyway, which is why Universal can get away with running Forbidden Journey, Mummy, Spiderman, and Transformers at half capacity for a large part of the day with 60+ minute waits and nobody bats an eye. Same reason places like Six Flags can have 120 minute waits on rides that have a theoretical capacity of 1800 an hour yet commonly average below 800.
I'm not making excuses, Disney clearly should be the industry leader when it comes to capacity- but pretending that Frozen is some disaster with regards to capacity is just silly. The downtime (which will be sorted out) is the main contributor for the lack of daily throughoutput right now. But as stated, doubling the ride's capacity would not shorten the queue time by a single minute. People will line up for 135 or 180 minutes for a new ride whether the ride does 500 an hour or 1500 an hour. More people will see the ride, but the queue time will remain the same- there will just be MANY MANY more people in the physical queue when it's a higher capacity ride.