I think WDW is filled with mediocre attractions with inflated wait times. I love Living with the Land, but I've even waited 30 minutes for that before. And that ride does not go over well with lay people. 45-70 minutes is what I call a standard wait time for any E-ticket, and SDMT is a faux E, so it makes sense.
Also, I think what drives me to Disney is the idea that appeasing people isn't the goal, its elevating the theme park experience. If it was about just giving people what they want, we'd see IP's shoved in regardless of theme or lands and an overall move to cram as much in as possible. I know I'm not alone as this is why people have been disappointed with the fairly recent direction of Epcot, the filling in of the Rivers of America for Cars, and even things like the Haunted Mansion interactive queue. You can argue that people like it, sure. But most people on here would argue that is makes the attraction weaker, artistically speaking. Same with the placement of the Hatbox Ghost.
So I guess it depends where you sit. If you think any additions are good if people like them, then sure, Disney can build 3 kiddie coasters that have 60 minute waits and have one show scene each. People will wait in line if the queue/facade look interesting enough. Or if you think Disney is an industry leader and the parks are a form of artistic expression that should capture the imaginations of folks young and old, then you might prefer a more substantial attraction that has more to offer than rockwork and a low height limit.