Actually, Audio Drum Styles have many distinct advantages over MIDI drums...it is not just sound quality, but, as I explained above (in only one instance), with Audio Drums multiple versions (almost unlimited) of snares, bass drums, toms, cymbals, can be used in the rhythm, something not possible with the MIDI Drums on any manufacturer's arrangers. The "feel" of the drum patterns can be more natural and realistic, since it is an actual drummer's (or, in some cases, drummers) performance being recorded.

Personally, I don't feel we will see midi drums being phased out, or replaced by Audio Drums...and, if Yamaha's drum kits don't float your boat (and perhaps other features don't appeal, either), it is easy enough (and encouraged) for the player to buy from a manufacturer that more adequately satisfies his/her wants and needs.

These days, it is fortunate we have a choice between brands of arrangers.

Ian