Something happens to give Clark 'more' life and reverse the BY life sucking after-effects--therefore eliminating the need to replace his heart?
Unless, of course, something like the BY machine is somehow used again and it sucks the life out of someone else to rejuvenate Clark. Of course, Clark would never willingly go along with that, but if he had been rendered unconscious before it happened, could you imagine the guilt he would feel knowing that he were alive only because someone -- presumably unwillingly, at that -- gave their life for him?
DC, this is definitely the mark of a good story -- you have us all speculating on what will happen, and coming up with lots of different possibilities.
Joy,
Lynn
