I dont know why pilots would want to use MM any way. The maps files are large, cumbersome and incoporate none of the advantages of moving to a digital media.
PocketFMS for example provides maps that are in my opinion far better at a fraction of the cost, with updates throughtout the year and they take full advantage of the move to a digital media.
In almost every way the most significant drawback still remains the availability of displays that are adequate for in cockpit use in terms of size, viewability of the display and battery life.