Star Wars Land, in most theme park fans' (including myself) opinion, is a dud... but it's a highly successful land that is generating attendance & revenue. Toy Story Land is a highly successful land (we can argue all day over the lack of theming attributed to budget cuts), but the land is very popular, especially with its target demographic. DHS is now the 2nd most popular park at WDW because of these 2 additions. Not a fan of them replacing Great Movie Ride and other changes at the park... but the general public loves it.
Like Nick Said, nobody was riding Energy Adventure. It was great for it's time, but Guardians is driving attendance into Epcot and is being better received.
If anything, adding the Beauty and the Beast Sing Along added capacity to the park because it provided an additional attraction for those, specifically with children, who maybe weren't interested in it previously. Now, there's effectively 2 attractions you can choose from versus 1.
My post doesn't defend Disney's choice to retheme/replace over true expansion, but a lot of what has been replaced were low-attended experiences and/or expansion pads.