Lizzie Olsen as Carrie? Blake Lively as Samantha? Could This Be the Cast of the Sex and the City Prequel?

Over the past year, there have been several reports, many of them conflicting, that a Sex and the City prequel film may be in the works. The most fun guessing game has of course been the cast. Earlier this year, Blake Lively was rumored to be playing Carrie, but subsequently denied those rumors. That may be because she's actually playing Samantha alongside a slightly younger cast, reports the Daily Mail. According to the British tab, the rumored cast is:
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Over the past year, there have been several reports, many of them conflicting, that a Sex and the City prequel film may be in the works. The most fun guessing game has of course been the cast. Earlier this year, Blake Lively was rumored to be playing Carrie, but subsequently denied those rumors. That may be because she's actually playing Samantha alongside a slightly younger cast, reports the Daily Mail. According to the British tab, the rumored cast is:
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Over the past year, there have been several reports, many of them conflicting, that a

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Is Blake (sexually) aggressive enough to be Samantha? Selena WASP-y enough to be Charlotte? Emma tough enough to be Miranda? Elizabeth "fabulous" enough to be the inimitable Carrie? Maybe?

Plus, much of the film will likely be set in the '80s, which can be hard to pull off if it's not styled well. Though if anyone could do it, it would be Pat Field.

What do you think of the cast? Should this movie even happen?