I'm all for it . Shootouts, cowboys on horseback, etc., too. One of the reasons that the Old West theme is "no longer exciting" is because they've taken most of the excitement out of it. Also, I think more needs to be done along the back end of the RoA - new animatronic animals, the return of, or at least new scenery to replace, the burning cabin and Cascade Peak - to make riding the Mark Twain or the Columbia feel more like an adventurous trip into the untamed American wilderness.
Getting back to the stagecoaches, I'm sure they could figure out a way to have them not tip over. It's been over 50 years since they created the original stagecoaches.