I am worried that everyone will die.
And they ******* deserve it too. The wall was built 8,000 years ago. Assuming that was the same level of technology as the Roman Empire they've blown it. Hadrian's Wall was built in 128 AD. Since then we've had the Renaissance, the Industrial Revolution, nuclear technology and space exploration.
If the White Walkers came for us we'd nuke the fuckers. Westeros should be 4 times as advanced as us, but they're not.
I blame the maesters for guarding all knowledge and generalising it to the nth degree so there are no doctors, physicists, chemists or engineers, just a load of mediocre maesters.
They brought it on themselves.