Well, while it could technically happen at any time, the fact that we're dealing with such huge timescales really means that "about to" or "soon" could mean "in 500 years time". I mean even 1000 years would be pretty "soon" if it hasn't happened for three quarters of a million years...
Quote:
Originally Posted by bitontheslide
i think there is the potential for us to destroy ourselves long before we have to update our compass settings 
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I sort of agree with this - I think humans will probably have totally wrecked the world within the next 200 years, all on our own, without unavoidable geomagnetic phenomena.