...I also think if they make [Laurel] Black Canary-ish, which they've said is in the plan, it is part of a very slow plan---like, we won't see her like that until season 3 or even 4.
I originally expected them to kill Sara and have Laurel take up her mantle to honor her, but I actually hope they do something less unexpected. Perhaps Sara will end up training Laurel, for example.
I would really rather not see Laurel as Black Canary, ever. Two reasons (neither of which is "I hate Laurel" because I don't, she merely disappoints me) --
One, I don't see her adding anything to the Black Canary identity; Sara already has the look, the sonic attack, a relationship with Ollie and a back story reason for having taken the name -- what would Laurel do differently that wouldn't distance her from the Canary identity as well as from Sara's stamp on it? Wear a blonde wig? Granted that would be a nod to the original comic character, and carrying on for Sara would be a reason to go blonde, but in costume there'd be no appreciable difference between Canaries I and II, making it change for the sake of change.
Two, Sara had years of training and daily life threatening hardship to build up the skills she has now. It would be insulting to hand the mantle off to a replacement in what would amount to a montage, even if it gets spread over a full season in two-minute scenes.