SDS, your problem is that you seem to think that making a statement and then waiting is how you get people to talk. That's entirely wrong. As host, your job is to facilitate discussion among the panel. Usually you do this by asking questions not monologuing for ten minutes, stopping, and hoping that someone says something else on top of you. It's an inherent flaw with your style of hosting. It's the SDS show not a discussion among panelists.
Ask more questions; make fewer statements.