I'm a bit ambivalent about this.
I think that people should see what is happening and be aware of what real court proceedings look like. If you are involved, it can be a bit overwhelming and this would be a way to try and show the general public how things are really done, to reduce the tension that can be a part of it.
However, having sat in a number of courts, I know that sometimes, the proceedings are truly dishwater dull for those that don't have a specific stake in the discussions or outcome. Seriously, the weather channel can be more entertaining at times.
What would worry me is that some members of the legal profession might try to play up to the cameras and then the court system might actually lose some credibility.