Did dumbo need a second spinner? Maybe...or they could have done what they used to and make a totally unique new ride, invested, and Gasp! Horror! spent more money (which the original budget would have allowed) to create a new experience for the guest rather than what really is for the most part "same old, same old." the spinners are nice but again nothing new, nothing that forced them to stretch their creative muscles. They took the cheapest route
Yes, they did need a second Dumbo spinner.
NEED.
It is a Walt original that amazingly still draws huge lines 57 years later. It's an iconic attraction, right up there with Space Mountain, that visually symbolizes a Disney park, appearing in nearly TV commercial, brochure, and promotional spot.
Unfortunately, due to its iconic popularity, wait time often exceeds an hour. And by its nature, it's biggest fans are toddlers and kids who aren't tall enough to enjoy many other iconic Disney attractions yet.
Hour waits + Florida heat/humidity + kids = uncomfortable kids, parents, and others standing in line beside them. (Name one other attraction that has such a miserable queue with such long waits for such a short, kid-friendly ride?)
Disney NEEDED to increase the capacity and make the queue more comfortable.
They've already added extra arms to the spinner decades ago. They simply couldn't jam any more on, or create 4-person cars.
They only way to increase capacity was to double Dumbo. That alone should cut a 60 minute wait down to 30.
Then they built an indoor queue to make that 30 minutes more pleasant. Then, rather than filling it with switchbacks, they gave kids a place to run around so they werent climbing on the rails and bumping into people waiting ahead of them (which even the best behaved kids with responsible parents will do during a fun day at a sweltering theme park)
Doubling Dumbo had the added benefit of requiring it to be re-located, allowing them to create a more logical and well-designed layout of FL.
The "cheap" option would have been to leave Dumbo exactly where it was, exactly how it was. That would have been darn cheap. Free.
But they spent money to improve a classic that visitors clearly want to ride.
Should money have been allocated differently for other FLE projects? That's obviously up for debate.
But Doubling Dumbo and adding a kid-friendly indoor queue is a no-brainer.