Doctor Who - Series 8

 Spoiler

My only guess to your comment about angles is that their are different types of angles. Similar to different Daleks/Cybermen. As for the baby angels and statue of liberty who knows, like I said different types?

As to the Rory being the only person to disappear; we don't know if there were any disappearances in the time Rory was in. There could have been and they never said.

As for Amy and Rory being stuck in the past, I am not entirely sure about that. I am skeptical with taking anything in Doctor Who literally-they leave holes open for practically anything. Remember that River LET Amy go and "blink." River knows much more at this time about The Doctor, Amy, and Rory at this time. (This is the 3rd oldest she has been/we have seen her.) We can only speculate why River let Amy go. Some say that Amy could have had something to do with Melody growing up.

Personally I think we will see Rory and Amy again, or at least hear more about them. The way they left it, left that option open. I know we want to think that they lived happily ever after, but we don't REALLY know. River told Amy something like, don't let The Doctor see the pain. We will never really know if Amy's afterword was truthful or what The Doctor wanted to hear. We don't know if Amy really found Rory or was sent to the same time. I still believe that they were and that Amy was telling the truth, but I would not be surprised if we see another story like Rose's ending.

We do have that 50th anniversary special coming along, but who knows. Don't forget "... on the Fields of Trenzalore, at the fall of the Eleventh, when no creature can speak falsely or fail to answer, a question will be asked — a question that must never be answered." I can only imagine the Paradoxes and time distortions that will cause.

 Spoiler

I'll refrain from making a joke about "angles", hah.

Anyway, they intentionally made it so that they could not bring Amy and Rory back. Though they could always get around it if they really really wanted to, it was intentionally done this way for that reason. I doubt we'll be seeing them anytime soon, if it all.