Lloyd Dugan gave a presentation at bpmNEXT calling for a simplified CMMN. Lloyd's presentation is summarized on BPM.com here.
Anatoly Belaychuk proposed that much of what can be done in a simplified CMMN can and should be modeled in BPMN. He makes his point here.
So do you think we need a simplified CMMN, or should we just learn how to use BPMN better?