Now, like most here and elsewhere, I royally like Brandon Routh as Superman and would hate to see him replace... which will most likely happen in a complete reboot. The way to get around that IMHO, is to do a Prequel. This would allow WB to give an origin story as I have discussed and maintain Routh as Superman for future installment. The Prequel could feature General Zod escape from the Phantom Zone and touch obviously on Lex Luthor. However, I would re-invent Lex as CEO of financial strap LexCorps, hence the reason for swindling the old lady's money, for his company and why Lex got off because there was no evidence or testimoney from Superman to link Lex to an invented crime in the confines of this new continuity.
WB just need to have imagination, creativity, and some profound understanding of the characters and their resources.