Maybe. As near as I can tell a pole reversal will make for some scrambled circuitry and perhaps some dangerous radiation in daylight hours until they re-orientate and the protective magnetic field re-forms. Don't know how long its going to take so maybe thats the driver for the construction of bunkers, DUMBs and similar.

Also given that all these things are rooted in myth, legend and lore, I wonder if the 'vampires cant go out in the sunlight' thing was from a previous pole reversal when the 'sunlight' was indeed dangerous to the then-survivors.