Comey has a few choices with the way this is going:
1) come clean
2) lie and get deeper in it, leak more for more leverage
3) resign
4) announce Trump is innocent, arrest a few leakers and get back business as usual
I am guessing he will choose the latter most option within the next week or two. What is unknown is what Obama and Lynch have on Comey, as he could be under duress.
Maybe Comey will take a hint from Gorsuch’s testimony that lawyers are a very unhappy bunch and have a high rate of suicide.