Noelveiga said:
Don't worry, I'm not arguing too much, I'm just not sure about 'humanity being killed off by their future selves, and hence not existing to destroy themselves' being less of a paradox than 'I'll cross my own timeline a little bit'. Within my own twisted idea of time travel, the first is impossible, the second is just... complicated.
But it's OK, because new technology can be pulled out of thin air to fix everything. Or Amy can use her new-found ability to hack the universe with her mind to make things better. Until some kind of mod comes to get her, anyway.
EDIT: I think some of the whole 'crossed timelines' thing is thanks to getting the previous doctor to say 'screw it, I'm a time
lord, so now I'm going to do whatever the hell I want with time. A slight suggestion that the character is less bothered with the consequences of his actions on continuity nowadays.