None of my predictions have come true, so far, and this show has a history of exceeding my expectations, but what the heck? I'll make some guesses about what happens next:

1) Lily will go through the procedure, but it won't work. Possibly for the same reason she didn't die when Victor shot her--she's too strong for that kind of nonsense now.

2) Lily will fake-out the boys and will take her revenge on the one she is left alone with--who will be Dr. Jekyll, thereby setting up the inevitable doom of that character.

3) Creature Clare will be happy with his family...until his son dies of consumption. But it won't be the death that destroys everything, because that would be too easy. Marjorie will say, "Let's pop over to that lovely resurrectionist who brought you back from the dead and we can all be a happy family again." And Creature will say, "NO. V.BAD IDEA. SRSLY." And the love and acceptance that allowed Margery to welcome Creature back into their home will smack up against Creature's own inability to accept himself, thus making a delicious tragedy for all us sadistic viewers to enjoy.

4) This won't happen during this season. It will get saved for next season when everyone is in Egypt (like you, I hope everyone will be in Egypt for a mummy plot).

5) Ethan, Malcolm, and Kaetenay will arrive in England shouting, "No fear, ladies! We are here to save you!" And Vanessa, Catriona, and Dr. Seward will answer, "We took care of it," as they sip wine and smoke black cigarettes while resting their feet on Dracula's beheaded body. Vanessa will be using the head for an ashtray.

6) Okay, I don't really believe that one will happen. But I sooooo want it to. Second best would be your theory that she is allowing him to drink her blood as part of a Clever Plan to kill the very heart of him, rather than just another body.

Also, I must concede that the constant references to Vanessa's fertility/Amunet's mother-of-evilness support your theory that the antichrist will appear in some future season. But it still annoys me. However, as I mentioned above, this show typically exceeds my expectations, so maybe they will do something with that trope that I find enthralling.