When Sir Alex does retire, Man United go after Moyes. Im 99.9% sure that United will make an attempt to take Moyes away from us. It just comes down to how loyal Moyes is to the club and what he has learned over the past 7 years since he's been here. I don't think he will leave. Personally, I recon he will probably stay with us until he retires, just like Sir Alex has done with United. Theres something about Everton football club. It will always be a part of you and I think Moyes could never leave us.
Then again you never know what can happen.
But one thing is for certain. If Moyes does leave, United will have to pay one huge compensation fee for him.