Is anyone claiming it's a failure? There's a difference between a successful land and a blockbuster that Disney wants. Is it as successful as Disney was planning on or not? In other media, Disney has shut down studios even when the product was successful, just because it wasn't as successful as they wanted. (Disney Infinity, animation studios, other game studios and other subsidiaries as an example) SWGE isn't going to have that, but it does show how much Disney emphasizes blockbuster performance.
I do think crowds will increase once word gets out about it. DHS opening is a complete wildcard, and it could go either way. It's not a sure bet like Potter was.