From this answer: <https://scifi.stackexchange.com/a/24022/1660>, I'd like to quote this:

> 
> The paradox energy essentially creates a shielded fixed point in time. That particular region of 1938 New York can neither be changed nor visited by the Doctor or the TARDIS. The Doctor mentions trying to penetrate such a fixed point could conceivably destroy New York or potentially the planet.
> 
> 
> 

Okay, so The Doctor can't land there to at least visit Amy and Rory. Well, can't he land outside New York and then, well, take a little walk to them?

**Edit**: Why can't it be visited by the Doctor anyway?

And, even if the Doctor himself can't walk into New York, surely Amy and Rory could go outside, no? So in Amy's afterword she would have said "Meet us in X place outside NY >\_>", so it is just a matter of the Doctor going there and waiting for them to come.