That’s all conjecture.
You don’t know that Trump was unaware of the recusal
You don’t know that Sessions has refused to resign
You don’t know if he has ever even been asked to resign
You don’t know Trump wants to fire him
You don’t know that the Senate would not hold a vote
And apparently you have either not been paying attention or have not drawn common sense conclusions. We know for certain from what both Sessions and Trump have said publicly that Sessions did not inform Trump of his intention to recuse before Sessions took the job. We know he refuses to resign despite the public excoriation heaped on Sessions by Trump. We know the president has been threatened by Republican senators that they would not move an AG nomination if Trump fired Sessions. We know all that and more from the public record. But you seem to be among the few who need a brick wall to fall on them before they see the problem.