If Russian SpecOps can’t pull it off, no way the Nigerians can. If they try those girls are dead.
http://en.wikipedia.org/wiki/Beslan_school_hostage_crisis
AND the Nigerian track record is not comforting:
http://en.wikipedia.org/wiki/Westgate_shopping_mall_attack
Russian special forces suck at hostage rescue. They are good cut throats that will go in and kill the bad guy (or the good guys given the current regime), but in typical Russian fashion put a low priority on civilian life. The Moscow theater rescue and Beslan are great examples of how you might as well bomb the hostages before calling them in.
I do not want to stereotype Nigerian forces because I do not know much about the country, maybe they are very professional and seasoned combatants. But I suspect some pessimism is warranted.
Read online that Israel was willing to help, since the IDF knows how to deal with terrorists.