AMG manages to do just fine without offering a manual transmission of any sort.

Automatics keep getting better and better, making less and less of a need for traditional robotized manuals like BMW SMG. I predict in a few years that all flappy-paddle gearboxes will be either traditional automatics with torque converters, or dual-clutch robo-manuals like VW DSG. All the single-clutch robo-manuals will be made obsolete.