I think Karma is an awesoem tool for people that want to create their own music and perform with it..
For people that Perform in a OMB arrangers and styles are way more suited.
Also for people starting out with keyboards Karma will be overwhelming.
But for pro's KARMA is a true tool of inspiration en ingenuity. It challenges their creativity.
To replace an arranger, there should be atleast 200 GE's to mimic the basic music styles, and a huge community to program even more.
Personally I think that KARMA would be a great addition to any TOTL arranger, but not a replacement, only an extra thing to add more indepth tracks to the styles..