What do anda think will happen with Christian and Liz now that Christian isn't dying?

If he's feeling kindhearted (rare) he will ask Liz if he can go sexually out of the marriage but still stay married to her for Wilbur's sake and to take care of Liz. If he's feeling selfish, he'll annul the marriage immediately and suffer Liz' angry backlash for a while (which will end because of Wilbur.)