There are three features forthcoming with the Rick Grimes (Andrew Lincoln) character, all to be released by Universal. Universal is now directly invested in the franchise and won't be so quick to dismiss its already built attraction.
As for your criticisms about it not being a top 10 house, frankly, it doesn't matter. It's a quagmire of a project to begin with, because it can't be too scary to alienate the park's primary audience (tourists with children). There just isn't room to substantially expand the experience or make it an E-ticket... and of course, not everything has to be a headliner. You need filler attractions to round out a park.