I think it was because those two Amys coulden´t exist at the same time. By putting young Amy in the Tardis they would have resued her, meaning old Amy could not exist. That´s a paradox.
Where in other cases it was simply past and future versions of the same person that do not contradict each other.
And nobody really believes Amy and Rory are living happily ever after? Either they get bored and contact the Doctor or it turns out that there is a problem only they can solve so the Doctor goes after them.
#7975043, By Freek The Official Doctor Who Thread
Freek 7,682 posts
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