The project was cancelled because only a dozen racers wanted the drop down for their MT4 and because it is considered as a preference option.

The majority want radio skins and back lights.

Airtronics (SANWA) have the M11X and M12 to address racers that want a radio that also includes a drop down. As for comments that all pro racers use the MT4, not true. They are sponsored to use the flagship radios, M11X and are now moving over to the M12.