Bella's blood will turn all the Cullen's human, and the entertaining scene following will happen:
Bella: Okay, I can FEEL that you bit me, but my hand isn't burning.
Edward: I have a funny feeling in my chest.
Bella: That's love, silly!
Edward: No, Bella, seriously. There's a really strange feeling in my chest.
Bella: What?
Edward: I think it's my heart.
Bella: WHAT?
Edward: ... I think it's.... beating? Okay, now that's just plain
WEIRD.
And then the Volturi will come and be like: WTFNO. And Jacob will be totes happy because he can beat up Edward now, but then he'll set eyes on, like, Jane and be all: "ZOMGLOVEYOU", and Jane'll be like: ZOMGMETOO, and bite Bella so she and Jake can be together for life and not make Jake vomit, and then Aro will see Angela and be like: "OMGHAWWTT" and will bite Bella to be with Angela, who'll be like: "OLDGUYSTURNMEON". And then Ben will be full lonely, but then Marcus will be like: "Rawr" and bite Bella to turn human to hang with Ben, and they'll move to London and get full "joined".
And then Tanya will rock up and be like: "EDDIE BABEZ. I LUFFS YOU", and Edward'll go: "You're fat. Go die"
And then Tahya'll be like: "I'M NOT FAT, IM BIG BONED" and full get mad and dive at Edward, but then Seth'll, like, leap on her and sit on her and then be like: "OMGIMPRINTED", and Tanya'll go: "AWESOME".
And the story will end with everyone moving into an abandoned warehouse with Santa Claus and getting magical powers to save Christmas. Also, Brandon Flowers will get mauled by a tiger.
[[And Linda and Mallie will engage in an epic battle for RSpunk, until he stands up and says: "WAIT, FANGIRLS! THERE'S ENOUGH OF ME FOR EVERYONE!"
And we'll all live happily ever after. For realz.]]
((I challenge you to say this on the podcast. CHALLENGE you. And you must do it with a Valley Girl accent. Srsly, for realz.

:P))
But no, seriously, I do think the first part will happen. Up until the arrival of the Volturi where everything turns into capslock and tweenspeak.