To be honest, I could see that area being rethemed to a steampunk feel, much like the ScreamPunk areas at Six Flags Magic Mountain and most recently Six Flags Over Georgia. Pandemonium makes a bit of sense in a steampunk theme, as the cars could perhaps be themed to gears of some sort - although the Maurer Sohne/MACK Rides round spinning cars would give off more of that feel than the Gerstlauer ones - and there's definitely room for theming around the coaster itself. As for expansion in the potential steampunk area, the go-karts are right next to Pandemonium and could perhaps be removed for some sort of flat ride expansion or maybe even a new coaster. A GCI woodie would be the perfect fit for Six Flags Fiesta Texas, although I see an S&S air launch coaster or multi-looping coaster (ala Steel Curtain but on a smaller scale) being more likely than that.