Personally I do not believe any sitting President would be brave to go after IBB in the short term. If the EFCC, AG or President ever tries to prosecute IBB in the near future the govt will be brought down via impeachment or the unthinkable, a coup.
IBB has enough power and money to destabilise any govt that does not cooperate with him.
The minute IBB is arrested, I am sure impeachment proceedings will start against the president. Remember OBJ's first term when he upset the powerful oligarchs by going for too many reforms, prosecuting "Big Men" and appointing who HE wanted to the cabinet? He was nearly impeached.
If you recall the National Assembly threatened to impeach OBJ after he announced he would probe govt entities including the National Assembly! The NA responded by giving him an ultimatum to resign or face impeachment. The whole thing was a charade sponsored by OBJ opponents who feared being probed.