Not to get off topic any further but those were originally installed with great theme elements when Time Warner owned the Six Flags chain and they were ramping up the theme elements in all the parks and pouring big money (at least for Six Flags) into them. They were really trying to compete with Disney and Universal (copying a lot of USF stuff as they did it) until they got tired of the business and sold the parks off after just a couple of years.
Back on topic, I'd still bet that there may be discussions about licensing the DC characters for a third park along with other Warner IPs for a third park. I think Universal and Warner have a good relationship with Potter that has been beneficial to both and they are probably looking for more ways to expand that. Warner has DC which is still a vital brand and they also will control theme park rights for LotR once the courts and Tolkien estate get everything settled unless something changes drastically. Both parties have to see lucrative possibilities in those and other IPs.