He's not going to testify if his defense team believes the prosecution has not made it's case. There is nothing to be gained and plenty to risk by allowing your client to testify if you are confident of a not guilty verdict. Most of those following this case have indicated that the prosecution has not met its burden so far and a conviction seems unlikely under Florida law. So there is no reason to put him on the stand. I just hope they wrap this trial up and don't make it a bigger circus than it has already become. All the media attention pressured the prosecution into overcharging Zimmerman. It seems almost impossible to get a murder conviction in this case under Florida law. They should have offered him a deal for a lesser charge.
Judge Flatt: Ollie, you know my feelings about arming morons: you arm one, you've got to arm them all, otherwise it wouldn't be good sport.