The problem with the acceptance of arranger keyboards in the wider keyboard community is the styles and use of styles.
If the trend continues to have more styles on an arranger, and the styles are more song specific, and the styles requires the player to play less but still sound good then acceptance of arrangers would go further down hill.
Arrangers are becoming more and more like glorified karaoke machines.
If the arranger can make you sound like a CD OTB, then the logical conclusion is it is the machine not the player.

Until persons who use arrangers use arrangers to showcase their individual playing ability and let the manufacturers know that is what they want, then arrangers would keep declining and soon you would not be able to tell the difference between an arranger and an MP3 player.