It should be. It's on a huge footprint and most families can get a much better version of the same experience closer to home or at other vacation destinations. It would be one thing if it was a really impressive, unique version of that attraction (i.e. something you could only do at Disney) but it's not even close to that. It's likely in the bottom 25% of ones that exist around the US.
They could put in a much better attraction there plus a table service restaurant.
You can also say that about Cosmic Rays just as much as you can say about Speedway and many other things. They are popular, relatively low cost and well received, so it remains.