I think Mitchell still needs more fights to become a name known to more people outside of the hardcore boxing fans. At present not many people know enough on him to make it into the clasic UK fight it should be. Not like Eubank/ Benn etc.

Khan see's himself as having bigger fish to fry and would see it as a step down to fight Mitchell.

It should happen, but won't for a while unless Khan loses or Mitchell keeps winning big fights.