Generally ONEWORLD EXPLORER fare changes occur every 6 months, in May and Nov.
The Jan 19th schedule was to accomodate only of the fare depreciation of the EGP and to basically halt the frenzied purchasing of RTW fares ex-CAI. It shouldn't affect the other currencies for now.
After the fare increase, yes CAIRO may still seem attractive to some given its proximity to the US. But there will be another place that'll be cheaper.
eg . After 19Jan, an AONE3 ex-CAI will be US$5738. The other place will be US$5095.
But best not to discuss it here. As you know, Oneworld monitors this board and will hike the fare accordingly.