If you really feel compelled to blame someone, blame the publisher. Y'know, the people who actually made the decision.
As far as it being the fanbase's fault, hopefully you realize that the fanbase here is a fanbase for "Competitive DOA," not a fanbase for "Misc Koei Tecmo stuff." They're not obligated to like the DOAX series, so trying to put blame on them is pitiful at best.
I generally attribute DOAX as a large part of the negative stigma surrounding the DOA franchise in general. I.e. A lot of people think DOA is a titty volleyball game first, fighting game second.
As far as it being the fanbase's fault, hopefully you realize that the fanbase here is a fanbase for "Competitive DOA," not a fanbase for "Misc Koei Tecmo stuff." They're not obligated to like the DOAX series, so trying to put blame on them is pitiful at best.