I guess it depends on which Mirages you are talking about. Rose I is BVR capable. Rose II/III are capable of precision attack/interdiction at night time which means, within a reasonable range, Mirages can conduct interdiction missions and make easy their escape by flying low to the ground. For as long as Mirages are in service, they can pose problems for any defending air force by virtue of their speed and fairly decent capabilities to deploy PGMs. The challenge with the Mirages is not necessarily around their lack of capability in the current threat environment, rather the spares. Its still a great strike platform.