Real Drawbars are the only way to control the Tone wheel sound as you need to physically manipulate and feel the shape of the drawbars, sliders are the next best form of control with wheels and touch buttons way down the list.
I still think Yamaha had the best idea on their FX range of organs (Electones) in the early to mid 80s, as all the sliders were motorised with their positions being memorised in the Preset.
However no matter what form the Tyros 3 takes they Yamaha will probably still sell them as fast as they can make them.

Bill