Not enough space for that ro realistically happen. Remember, Tatsu does curve around the Sky Tower in close proximity.
As for Lex Luthor, I hate the idea of losing the 400ft drop tower. I wish there was a way they could save it (and for the love all things themed... ENCLOSE. THE. DAMN. PATHWAY/LOAD AREA!!). Freefall/upward launch rides are simplistic & fun. The park needs it. But at the same time, it might need to be relocated to be within the actual DC Universe/Metropolis land(s).