MQM is stats-qualifying miles (with Delta), not status itself. And just because you can use MQM to help you earn status, I don't know know whether you can use just MS'd MQM to earn meaningful status. But even if so, it would only help if you live somewhere where Delta status would work for you. (Ironically, with many airlines, middle status may work better from a non-hub city than a hub city, because at a hub city you have too many competitors with even high status than you. Of course, that assumes that your purpose of pursuing status is upgrades, if it's lounge access on international economy flights, that may be different.)