I've been working on a fic for more than two years (writer's block some) where Martha explicitly states who knows how to reach the Doctor and that he'd come for anything serious. Watch "The Stolen Earth" again and you'll see how they should have reacted - they know this is way over their heads and ask for help.

People always seem to assume I hate CoE because I'm a butthurt shipper (I am a shipper, but not a butthurt one...) and somehow it never occurs to them I don't like it because it doesn't make sense in the Who universe.