This is such a tired argument. It makes no sense. Did purchasing the Twilight Zone stop the Tower of Terror from being one of the greatest attractions of our generation? Sure, there have been some bad character attractions, but the same can be said for "original" ones. Look at the abysmal failures of Golden Dreams, Superstar Limo, Journey into Imagination, the Timekeeper*, and the like. The greatest of an attraction has nothing to do with where the property from. It has everything to do with the quality of the execution, the entertainment value, and the overall guest experience.
*I LOVED that show, but almost no one else did.