Hopefully they can convince her to stick around longer. I read she doesn't want to be separated from her family in Maine for too long. I think her story will take longer than 3 weeks to play out. I loved Luke and Laura. :-)
I think that Laura will only be on for a short time unfortunately. You know how that rumor is going around that Lucky is going to accidentally kill someone? I think he will kill her, while she is trying to save him.
I don't think he kills Liz. She's around for awhile. She just signed another contract a while back. I think he relapses because Maxie's pregnant and finds out Liz slept with Jason and Jason's the daddy. :o