I think this was only a bail hearing.
I've read that under Florida's stand your ground law, Zimmerman is entitled to another hearing before a judge (no jury yet), who will decide if the case should be dismissed on SYG grounds.
If Zimmerman loses in that hearing, he then gets another chance with a trial before a jury. That's my understanding anyway.
I imagine that you’re right. I don’t really know how court proceedings usually go. It seems strange that they would have a bail hearing first when there is the possibility the case could be dismissed. That’s sort of a waste of time and an imposition on the accused when a decision to dismiss would obviate the need for a bail hearing.