Articles on the fear of the Earth's field flipping are, as expected, not very realistic. The best current knowledge is that it takes thousands of years for the field to flip and the current fluctuations are within normal bounds. The wikipedia article on the Earth's magnetic field[1] is pretty good. See relevant quote from it below. Scientists recently updated the standard Gaussian coefficients used to describe the Earth's field a bit earlier than the usual 10 year adjustment. This is because the field has changed a bit quicker than the recent past and people are more interested in having a high accurate model these days, among other reasons. The release of this new model is why these kinds of stories are in the news at the moment.
The Earth's magnetic field is created mostly by the convecting liquid iron/nickel outer core of the Earth. It is a quite turbulent system and can not be modeled very well for numerous reasons. Here are a few:
The pressure and temperature is so high that depth (2900-5100km below the surface) in the Earth that is impossible to create similar conditions on the Earth's surface for more that milliseconds on milligram samples. The only measurements that can be made of the core are from seismic waves passing through thousands of kilometers of the heterogeneous Earth. We have decent measurements for the Earth's magnetic field only since people have been recording compass readings (1600AD or so) and really good global measurements only since satellite readings starting in the 1960's. IAAPM (I am a paleomagnetist)[2] and am happy to answer questions about this topic.
"At present, the overall geomagnetic field is becoming weaker; the present strong deterioration corresponds to a 10–15% decline over the last 150 years and has accelerated in the past several years; geomagnetic intensity has declined almost continuously from a maximum 35% above the modern value achieved approximately 2,000 years ago. The rate of decrease and the current strength are within the normal range of variation, as shown by the record of past magnetic fields recorded in rocks."
[1]https://en.wikipedia.org/wiki/Earth%27s_magnetic_field