While I think the idea of having ships leave Cloud City is a rather excellent one, I don't agree on the idea of having Tie Fighters shooting them down. Something like that would be a very powerful moment, and just coming out of not one but two powerful moments is pretty filling in on itself.

And for something like that to even happen, there would have to be something to establish it. Seeing tie-fighters shoot down civilian ships would be kind of random. There is nothing to gain from shooting down the ships. They're not rebels and they pretty much had nothing to do with the rebels.

Also, wouldn't the idea of Lando telling his people to flee only to be shot down be kind of careless of him?