If the goal is a Hilary coronation, then yes, a debate that nobody watches gives Bernie no viewers and less chance. Hilary fought for fewer debates. Crappy debate schedule that nobody is home to watch is the next best thing.
The left wants Hilary. Few debates that nobody watches is good for her. She doesn't have to swing as left. Repubs are forced to go very far right in primary which hurts then later. Hilary is coasting. She'd schedule debates during the nfl playoffs of she could. The 20 point front runner hates debates.