You can hardly blame your current customers for eschewing arranger software... Few arranger players are buying it because of the fact that, as an arranger, it is styled and voiced OOTB considerably inferior to a Big 3 TOTL arranger. People are buying it because it makes an excellent WS and open VSTi player. So you are not polling arranger players...

Poll a bunch of PA2Xpro or SD-1 or E80 users whether THEY would like to have native Yamaha styles on THEIR arrangers, and you are MUCH more likely to get a positive result. That's because these people actually ARE arranger players

I would buy the MS in a flash if I wanted a live keyboard that played VSTi's, and functioned as a fully flexible WS, loopstation and DAW. Trouble is, me and most other arranger players want an ARRANGER. And THEN add that other stuff. I think your polling data just shows how just about everybody BUT you think about the MS. They all use it as a VSTi WS, not an arranger... (OK, some generalization going on here, but you can't argue with your own poll, can you? )

Sad thing is, if instead of spending all this time and energy trying to get LS and an XG soundset working, you had simply spent all that energy trying to get some great MS styles written, perhaps there WOULD be more arranger users responding to your questionnaire...