Illinois legislature justified the approval of gambling in Illinois by arguing that riverboats would revive the downtowns. The two-boat Hollywood Casino opened in Aurora in 1993. Last month, the owner, Penn Entertainment, said it wanted to close the long-docked riverboat downtown and rebuild it on a site closer to I-88. Penn also announced a similar plan for the casino in Joliet. Illinois casinos have become like NFL franchises, skilled at lobbying and dangling the promise of revenue to cash-strapped cities. Chicago has already seen a fascinating shift within its new, long awaited casino.